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8/31/26, 8:45 AM
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Cesar Augusto Zen Vasconcellos (UFRGS/ICRANet)8/31/26, 9:00 AMTalk
The Thirteen Towers of Chankillo (fourth century B.C.E., coastal Peru) form a calibrated solar observatory whose visual span of 47◦ exactly matches the Sun’s annual declination range. This correspondence is not a coincidence of natural topography but the result of deliberate architectural design: the towers are positioned along a gently curving ridge at a fixed distance of approximately 235 m...
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Dr Miguel Alcubierre (ICN-UNAM)8/31/26, 9:30 AMTalk
In this talk, I will present some recent results regarding the study of boson stars and Dirac stars—self-gravitating systems in general relativity formed by massive complex fields, whether scalar, vector, or spinorial. In particular, I will consider spherically symmetric stationary solutions and their stability properties under perturbations.
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Xavier Dupac (European Space Agency)8/31/26, 10:20 AM
Euclid is European Space Agency’s space telescope dedicated to cosmology, through two main probes: weak lensing and galaxy clustering. It was launched in July 2023 and is now in its third year of survey. It is performing a large photometric and spectroscopic survey of galaxies over 14000 sq. deg. of the Extragalactic sky (Wide Survey), as well as a Deep Survey of three areas of the sky (53 sq....
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Dr Miguel Ángel García-Aspeitia (Universidad Iberoamericana)8/31/26, 11:30 AM
Abstract: In this talk, I will discuss an interesting model that can be detected directly through gamma-ray emission, producing a signal that can be detected in future experiments. Additionally, we discuss a model that produces an accelerating phase without the necessity of a dark energy component, only breaking the symmetry of homogeneity.
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Dr ERI ATAHUALPA MENA BARBOZA (Centro Universitario de la Ciénega, Universidad de Guadalajara)8/31/26, 11:50 AMTalk
We present the implications of incorporating noncommutativity into f(R) gravity. In particular, we explore the proposed framework in a flat FRLW background. We introduced a deformation in a 2n-dimensional phase space.
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Dr Vesselin Gueorguiev (NCIS, RIIS 2.0, and IAPS)8/31/26, 12:10 PMTalk
The nature of dark energy (DE) challenges our comprehension of the cosmos, appearing as the source responsible for the Universe’s accelerating expansion. This work considers the Einstein Cosmological Constant (ΛE) as a manifestation of DE, interpreted through the lens of Reparametrization Invariant Scaling Symmetry (RISS). Within this paradigm, ΛE emerges as a “kinetic energy” term, derived...
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Dr Mariana Vargas (IF-UNAM)8/31/26, 12:30 PM1
With three years of data, DESI is providing an increasingly precise view of the late-time Universe. In this talk, I will review what we have learned from DESI so far, from BAO to the latest full-shape results, and discuss the cosmological picture emerging from these measurements. I will then look ahead to the next steps: extracting more information from large-scale structure, going beyond...
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Dr Francisco Siddhartha Guzman (UMSNH)8/31/26, 3:00 PMTalk
We present a multi-scale analysis of ultralight Bose-Condensate Dark Matter (BECDM). In a first scenario we study the case of the BECDM alone, and start with the construction of non-spherical BECDM halos using multimode expansions, demonstrating that a core-envelope structure effectively recovers the rotation curves of LSB galaxies, the quantum effects of a halo are discussed from the core to...
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Eduardo Leon Guendelman (Ben Gurion University)8/31/26, 3:50 PMTalk
The string tensions can be dynamical in the modified measure formalism and appear as an additional dynamical degrees of freedom . These tensions may not be universal, instead, each string generates its own tension. We then consider a new bulk field that can couple to the strings, the tension scalar which changes locally the tension along the world sheet. In the case with two string tensions...
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Dr Argelia Bernal (Universidad de Guanajuato)8/31/26, 4:20 PM
Abstract: Scalar field dark matter could provide a unified framework to describe galactic halos. In this talk, we present two complementary approaches based on self-gravitating scalar field solutions. First, we study ℓ-boson stars as dark matter halos and infer their parameters using observed rotation curves. Second, motivated by the presence of supermassive black holes at the centers of...
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Boris Betancourt Kamenetskaia (Institute for Basic Science CTPU-CGA)8/31/26, 4:40 PMTalk
A strongly self-interacting component of asymmetric dark matter (DM) particles can form compact dark stars (DSs). These objects have a broad spectrum of masses and radii, with distinct evolution histories from both neutron stars and black holes (BHs). We argue that these differences allow a population of DSs to contribute significantly to the astrophysical merger rate in unique and discernible...
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Dr Sergey S. Borisov (P.N. Lebedev Physical Institute, Russian Academy of Sciences)8/31/26, 5:20 PM
IC 443 is a middle-aged SNR whose age, however, is estimated with high uncertainty to be from 3 to 30 10 3 years. IC 443 shows signs of interaction of SNR shells with surrounding molecular clouds and may also be overlapping with the older SNR G189+3.3. IC 443 has been intensively studied through multiwavelength observations in radio, X-rays, and MeV-TeV energy ranges, which aimed to reveal the...
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Dr Edgar Alejandro León Espinoza (Universidad Autónoma de Sinaloa)8/31/26, 5:40 PMTalk
We start by examining the relations between the Kruskal representation and stereographic projection. Motivated by novel results in spherically-symmetric metrics, we explore the analogue of conformal-Minkowski mappings. To this end, we introduce 'Diamond Coordinates,' a compactified representation that naturally delineates local causal diamonds. By analyzing the worldlines of observers within...
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Dr Adrian William Romero Jorge (Frankfurt Institute for Advanced Studies/Goethe University Frankfurt)8/31/26, 6:00 PMTalk
We investigate a dark sector coupled to the Standard Model (SM) through a kinetically mixed dark photon
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associated with a new
gauge symmetry. Kinetic mixing, parametrized by
, induces an effective coupling to the electromagnetic current, while the dark photon interacts with a stable dark matter (DM) particle
through a dark gauge coupling
, defining a four-dimensional parameter... -
Dr Sergio Mendoza (IA-UNAM)9/1/26, 9:00 AM
This work presents a formal mathematical and arithmetic framework for the construction of the ancient 260-day Mesoamerican ritual calendar. We demonstrate that the fundamental calendar relation (365×52=260×73) is a direct representation of Kepler's third law of orbital motion in synodic coordinates. Using a generalized definition of a short calendar count derived from symmetrical...
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Dr Luis Ureña (Universidad de Guanajuato)9/1/26, 9:30 AM
We present constraints on axion quintessence dark energy using the latest cosmological observations. Focusing on the physical parameters of the model, we find a preferred axion mass of log10(ma/eV)≃−32.6\log_{10}(m_a/{\rm eV}) \simeq -32.6log10(ma/eV)≃−32.6 and a decay constant of log10(fa/MPl)≃0.1\log_{10}(f_a/M_{\rm Pl}) \simeq 0.1log10(fa/MPl)≃0.1. We perform a Bayesian model...
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Dr Jorge Cervantes (ININ)9/1/26, 10:20 AMTalk
Recent results from the DESI collaboration suggest a preference for an evolving dark energy (DE) component rather than a cosmological constant, motivating the exploration of alternative models for the background expansion. These data also reveal tension in the inferred matter density parameter -- lower in DESI and higher in Planck -- as well as a neutrino mass posterior that approaches the...
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Dr Tula Bernal (U de Chapingo)9/1/26, 11:30 AM
Observations have confirmed that satellite galaxies of the Milky Way, as well as those of Andromeda and Centaurus A, exhibit a non-homogeneous distribution known as the Vast Polar Structure (VPOS), where satellites show orbits aligned perpendicular to the host galaxy's plane. Conventional Cold Dark Matter (CDM) models face significant challenges in explaining this anisotropic distribution...
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125. A natural explanation of the Galactic Magnetic Fields from multi-state Scalar Field Dark MatterDr Maribel Hernández-Márquez (ICN-UNAM)9/1/26, 11:50 AM
Galactic magnetic fields with strengths of order microgauss and coherence lengths of kiloparsecs have been observed in galaxies. These fields tend to follow the interarm regions of spiral galaxies, but their origin remains an open question.
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In this work, we investigate the possibility that the large-scale magnetic fields observed in galaxies arise naturally from a complex Scalar Field Dark... -
Dr Leonardo Sánchez Hernández (UAM-I)9/1/26, 12:10 PM
The Fermi Bubbles are two approximately symmetric, lobe-shaped gamma-ray-emitting structures extending above and below the Galactic disk of the Milky Way, roughly along its rotation axis, to distances of about 9 kpc. Despite their discovery in 2010, their origin and formation history remain unclear. Leading proposed scenarios include outflows driven by past AGN activity and supernova feedback....
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Dr Lam Hui (Columbia University)9/1/26, 12:30 PM
We will discuss the possibility that dark matter is composed of particles lighter than about 10 eV,
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in which case, the dark matter galaxy halo is best thought of as a set of waves. The astrophysical
consequences, and the experimental implications for axion detection, will be discussed. -
Prof. Olivier Sarbach (UMICH)9/1/26, 3:00 PMTalk
We discuss a new dissipative fluid theory on an arbitrary (flat or curved) spacetime background. This theory is obtained from kinetic theory by applying a new version of the relativistic Chapman-Enskog method to derive the constitutive relations to first order in the Knudsen parameter. The novelty of our approach consists in applying a suitable projection method to solve the linearized...
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Dr Israel Quiros (U Guanajuato)9/1/26, 3:50 PM
We develop a formalism for generating solutions of conformal gravity theories. It is based on the result that the only static and spherically symmetric vacuum solutions of conformal general relativity are conformal to the Schwarzschild-de Sitter solution. The relevance of the formalism for the understanding of conformal symmetry, along with its physical and geometrical consequences, is...
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Dr Sergio Hernández Cadena (SJTU)9/1/26, 4:20 PM
Galaxy clusters are the largest gravitationally-bounded systems in the Universe. In these objects, the dark matter (DM) represents almost 85% of their content, while ~5% are galaxies and the rest corresponds to hot gas filling the Intra Cluster Medium (ICM). If the DM is a heavy particle like the Weakly Interactive Massive Particles (WIMPs), galaxy clusters are exceptional targets to...
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Dr Mehrab Momennia (UMSNH)9/1/26, 4:40 PM
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102. Investigations of the unique active galaxy 4C +55.17 for the probe of some cosmology parametersDr Vera Y. Sinitsyna (P.N. Lebedev Physical Institute, Russian Academy of Sciences)9/1/26, 5:20 PM
Extragalactic background light (EBL), formed by the light radiated and re-radiated by stars, galaxies, and active galactic nuclei throughout the evolution of the Universe, brings the imprint of the history of the rate of formation of emitting astrophysical objects and the universe expansion. It makes EBL one of the fundamental quantities in cosmology. Optical depth for high-energy emission...
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Dr Iván Hernández Garibay (Goethe University Frankfurt)9/1/26, 5:40 PM
Understanding the extreme conditions inside neutron stars represents a
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major challenge for Astrophysics. Here I present our investigation on
the behaviour of curvature invariants for a large ensemble
of neutron stars built with equations of state (EOSs) that satisfy
constraints from nuclear theory and perturbative QCD, as well as
measurements of neutron-star masses, radii, and... -
Dr Valeriy Dvoeglazov (Universidad Autonoma de Zacatecas)9/1/26, 6:00 PM
Universidad Autonoma de Zacatecas, Mexico
It is well known that the relativistic equations have acausal
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solutions, which have generally been ignored. This is particularly
true for higher spins. We consider spin 1/2 and spin 1 in this talk.
We analyze corresponding propagators which may indicate if a theory is
local or non-local. Negative-energy and tachyonic solutions are... -
Dr Peter Otto Hess (ICN-UNAM)9/3/26, 9:00 AM
The pseudo-complex version of the Friedmann–Lemaître–Robertson–Walker model (pcFLRW) is presented within the framework of pseudo-complex General Relativity (pcGR). In this approach, dark energy emerges as a geometric consequence of the pseudo-complex structure, leading to a specific functional form for the Hubble parameter H(z) characterized by a single geometric parameter beta. This parameter...
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Dr Alma González (Universidad de Guanajuato)9/3/26, 9:30 AM
The NSF–DOE Vera C. Rubin Observatory began its ten-year Legacy Survey of Space and Time (LSST) in mid-2026, marking the start of an unprecedented survey of the southern sky. In this talk I present an overview of the observatory's current status from my perspective as part of the Mexican participation in the project, providing context for the broader community. I then turn to the scientific...
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Dr Dorota Gondek-Rosinska (University of Warsaw)9/3/26, 10:20 AM
Resumen: Ten years after the historic first detection of gravitational waves, I will explore how this new window into the Universe has transformed our understanding of the Universe. I will review the remarkable progress of the global LIGO Virgo and KAGRA network over the past decade, highlighting some of its most important breakthrough results. I will discuss the newly released GWTC-5 catalog,...
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Dr Roberto Sussman (ICF-UNAM)9/3/26, 11:30 AM
Fitting cosmic observations with General Relativity and the Cosmological Principle requires assuming the existence of a dark sector that dominates gravitational dynamics and whose fundamental properties are still unknown. This fact has motivated the search for alternative gravity theories, which so far has given mixed results. In particular, 4th-order theories are mathematically intractable...
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Dr Sebastián Nájera (ICF-UNAM)9/3/26, 11:50 AM1Talk
We present a fully relativistic treatment of cosmological peculiar velocities within General Relativity, moving beyond the standard Newtonian approximation commonly employed in large-scale structure studies. Peculiar velocity fields are derived from analytic solutions of Einstein’s equations sourced by non-perfect fluids and interpreted through frame transformations with respect to a...
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Dr Leonel de la Cruz Bixano (Cinvestav)9/3/26, 12:10 PMTalk
This talk presents new exact rotating wormhole solutions in Einstein–Maxwell–Dilaton (and Phantom) gravity. Their geometric structure, causal properties, traversability, tidal forces, electromagnetic fields, and the role of Wormhole Cosmic Censorship are discussed, providing physically viable wormhole configurations.
A natural explanation of the Galactic Magnetic Fields from multi-state...
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Dr Cesar Augusto Zen Vasconcellos (UFRGS/ICRANet)9/3/26, 12:30 PM
The 500 m Precision Floor in Neutron Star Radius Measurements
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abstract. Multi-messenger observations of neutron stars aim to constrain the dense-matter equation of state via mass-radius measurements. We demonstrate that, for a canonical 1.4 M star, current crust-modeling uncertainties impose a persistent∼500 m precision floor in radius predictions. This threshold is comparable to—and in some... -
Dr Emilio Tejeda (Instituto de Física y Matemáticas, UMSNH)9/3/26, 3:00 PMTalk
We present the Hybrid Relativistic-Newtonian Approximation (HRNA), a novel and computationally efficient framework designed to simulate the dynamics of self-gravitating systems orbiting within a fixed, curved background spacetime. The HRNA operates at the intersection of two physical regimes: the global motion follows exact general relativistic geodesics in a black hole metric, while the...
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Dr David Edwin Alvarez Castillo (UANL)9/3/26, 3:20 PM
Abstract: In this work we present hybrid stars with a superconducting quark matter core covered by a hyperonic nuclear matter. The deconfined phase is modelled within a chirally symmetric density functional approach and follows a first order phase transition via a Maxwell construction from a hyperonic DD2 equation of state. While the hadronic phase is fixed, the range of properties of the...
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Dr J. Rodrigo Sacahui (Universidad de San Carlos de Guatemala)9/3/26, 3:40 PM1
Several correlations have been proposed as possible pseudo-redshift estimators. Among the most widely used are the Amati correlation, which relates the peak energy (Epeak) of the spectrum — when modeled by a Band function — to the isotropic energy; the Yonetoku correlation, which relates luminosity to the peak energy of the most intense episode of the burst; and the Guiriec correlation, which...
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Dr Wei-Liang Qian (University of Sao Paulo)9/3/26, 4:00 PM1
Understanding strongly interacting matter under extreme conditions is
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a common theme across relativistic astrophysics, early-Universe
cosmology, and high-energy nuclear physics. Relativistic heavy-ion
collisions offer a terrestrial laboratory for probing the quark–gluon
plasma through its collective flow. In this talk, I will present a
maximum-likelihood-estimation (MLE) framework that... -
Dr Ethan Carlier (Université Libre de Bruxelles)9/3/26, 4:20 PM
The observation of the gravitational-wave signal GW170817 from a binary neutron-star merger marked the beginning of a new era in astrophysics. Such events offer unique opportunities to probe the properties of matter under conditions so extreme that they cannot be reproduced in terrestrial laboratories. During the inspiral phase, neutron stars undergo slight deformations induced by the tidal...
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Dr Sergio Mendoza (IA-UNAM)9/3/26, 4:40 PMTalk
I present a relativistic modified gravity theory based on a scalar function of the torsion tensor. In the weak-field limit, the field equations naturally reduce to the deep-MOND regime without introducing dark matter. This framework simultaneously reproduces the observed deflection of light across individual galaxies and clusters, and yields an exact derivation of the baryonic Tully-Fisher...
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Dr Cynthia Ahiezer Vizcarra Ventura (Universidad Continental)9/3/26, 5:20 PMTalk
Magnetars are natural laboratories to study matter under very strong magnetic fields at high densities. These extreme fields can modify the microscopic structure of matter by incorporating the idea of the Landau levels, which immediately the equations of state possibly triggering a phase transitions at the stellar cores. However, a full understanding of the interaction between magnetic fields...
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Dr Vera G. Sinitsyna (P.N. Lebedev Physical Institute, Russian Academy of Sciences)9/3/26, 5:40 PMTalk
Cyg X-3 is the famous galactic High-Mass X-ray binary system formed by a black hole that orbits a massive Wolf-Rayet star. Huge radio-flares are accompanied by the ejection of powerful jets like those seen in active galactic nuclei, making Cyg X-3 a microquasar-type object. Moreover, the activity of these jets is correlated with X-ray states. The X-ray and infrared emission from Cyg X-3 are...
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Dr Ana Laura García Perciante (UAM-C)9/4/26, 9:00 AMTalk
Relativistic fluid theories derived from kinetic theory provide a consistent framework for describing transport processes in out-of-equilibrium systems. In this context, first-order perturbative solutions of the relativistic Boltzmann equation lead to constitutive equations that couple dissipative fluxes to both spatial and temporal derivatives of the state variables, as well as to the...
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Dr Ulises Nucamendi (UMICH)9/4/26, 9:30 AM
Abstract: In this talk, we perform a dynamical systems study of purely kinetic k-essence. Although the single-field models considered here have been studied in the past, a comprehensive study of the phase-space dynamics, incorporating stability conditions to ensure theoretical consistency, is lacking. Our results confirm rigorously and clearly that these models i) cannot explain in a unified...
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Dr Enrique Vázquez Semadeni (IRyA UNAM)9/4/26, 10:20 AM
Classical Newtonian gravitational collapse is often envisioned as a spherical, homologous contraction that happens locally, all at once, and in isolation. However, this is an extremely unrealistic picture. Here I review the main features of realistic collapse: 1. Spherical collapse is non-homologous. This implies that the collapse does not occur at once, but rather develops a continuous...
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Dr W. S. Hipolito-Ricaldi (Universidade Federal do Espírito Santo)9/4/26, 11:30 AMTalk
We present a stochastic forward framework for modeling the dispersion measure (DM) of Fast Radio Bursts. The intergalactic DM is formulated as a line-of-sight integral through a structured cosmic web, with fluctuations arising from stochastic encounters with halos and filaments. This naturally induces a full probability distribution P(DM∣z), capturing both the mean signal and the cosmic...
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José Serna (Instituto de Física - Universidad Nacional Autónoma de México)9/4/26, 11:50 AMTalk
We present constraints axion-like particles (ALPs) derived from 7.5 years of very-high-energy gamma-ray observations of the radio galaxy M87 with the High Altitude Water Cherenkov (HAWC) Observatory. ALPs are well-motivated dark matter candidates that can oscillate into photons in the presence of external magnetic fields — a phenomenon known as photon–ALP conversion — potentially producing...
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Alvaro Pratts (IF-UNAM)9/4/26, 12:10 PM1Talk
Axion-like particles (ALPs) represent well-motivated candidates for dark matter. However, searching for ALPs using very-high-energy (VHE) gamma-ray observations requires a multidisciplinary approach that is seldom addressed comprehensively in a single reference. In this work, we present a practical guide for researchers entering the field, outlining the essential steps to develop a robust...
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Prof. Thomas Boller (Garching MPE)9/4/26, 12:30 PMTalk
Their X-ray spectra are characterized by a prominent soft excess below 2 keV, typically interpreted as warm Comptonization from the inner accretion disk atmosphere or relativistic reflection. In the harder 0.7-10 keV band, NLS1s exhibit steeper power-law photon indices (Gamma > 2.5) than traditional broad-line AGN. Because of their lower central masses, they show rapid, high-amplitude X-ray...
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Dr Jorge Horvath (IAG USP São Paulo Brasil)9/4/26, 12:50 PM
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Leonardo Sánchez Hernández (Universidad Autónoma Metropolitana Unidad Iztapalapa)Talk
We study spherically symmetric, time-independent solutions of the Einstein field equations sourced by a complex scalar field charged under a $U_a(1)$ gauge field that is kinetically mixed with a second $U_b(1)$ gauge field. This scenario is motivated by the Scalar (Fuzzy) Field Dark Matter model (SFDM) charged under the massless Dark Photon (DP) interaction.We find compact, self-gravitating,...
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Gustavo Magallanes-Guijón, Sergio MendozaTalk
Sagittarius A (Sgr A), the supermassive black hole at the center of the Milky Way, provides a unique laboratory for investigating high-energy emission processes and the dynamics of matter in strong gravitational fields. Detecting periodic or quasi-periodic variability in its gamma-ray emission can provide important constraints on particle acceleration mechanisms, accretion processes, and...
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Sergio MendozaTalk
This work presents a formal mathematical and arithmetic framework for the construction of the ancient 260-day Mesoamerican ritual calendar. We demonstrate that the fundamental calendar relation (365×52=260×73) is a direct representation of Kepler's third law of orbital motion in synodic coordinates. Using a generalized definition of a short calendar count derived from symmetrical...
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141. A natural explanation of the Galactic Magnetic Fields from multi-state Scalar Field Dark MatterProf. Maribel Hernández Márquez (ICN-UNAM)Talk
Galactic magnetic fields with strengths of order microgauss and coherence lengths of kiloparsecs have been observed in galaxies. These fields tend to follow the interarm regions of spiral galaxies, but their origin remains an open question. In this work, we investigate the possibility that the large-scale magnetic fields observed in galaxies arise naturally from a complex Scalar Field Dark...
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Luis Bryan Mendoza Meza (Centro de Investigación y de Estudios Avanzados del Instiuto Politécnico Nacional)Poster
In this work, we investigate the possibility that the large-scale magnetic fields
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observed in galaxies, of the order of microgauss, arise naturally from a complex Scalar Field Dark Matter (SFDM) halo charged under a local U(1) symmetry. Extending our previous work, where multistate SFDM solutions were shown to form “gravitational atoms” capable of explaining the anisotropic distribution of... -
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Alvaro Pratts (IF-UNAM)Talk
Axion-like particles (ALPs) represent well-motivated candidates for dark matter. However, searching for ALPs using very-high-energy (VHE) gamma-ray observations requires a multidisciplinary approach that is seldom addressed comprehensively in a single reference. In this work, we present a practical guide for researchers entering the field, outlining the essential steps to develop a robust...
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W. S. Hipolito-Ricaldi (Universidade Federal do Espírito Santo)Talk
We present a stochastic forward framework for modeling the dispersion measure (DM) of Fast Radio Bursts. The intergalactic DM is formulated as a line-of-sight integral through a structured cosmic web, with fluctuations arising from stochastic encounters with halos and filaments. This naturally induces a full probability distribution P(DM∣z), capturing both the mean signal and the cosmic...
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64. Beyond the Binary: A Quaternary Algebraic Framework for Inka Mathematics in the Yupana and KhipuCESAR AUGUSTO Zen Vasconcellos (UFRGS/ICRANet)Talk
abstract. The decipherment of Inka mathematics stands at a crossroads. Rojas-Gamarra and Stepanova (2015) proposed a positional, base-10 interpretation of the Yupana and Khipu. In contrast, Overmann and Florio (2025) argue for a non-positional, additive system based on the visual ambiguity of khipu knots. This paper resolves this contradiction by demonstrating that both interpretations capture...
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Mehrab Momennia (Universidad Michoacana de San Nicolás de Hidalgo)Talk
The dark matter-black hole interaction is modeled with the help of the accretion of a Vlasov gas into a rotating Kerr black hole. We provide exact analytic expressions for the particle, mass, and angular momentum accretion rates in the form of integrals. These integrals are computed numerically and compared to more explicit relations in the slow-rotation approximation. The explicit analytic...
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Dr Mehrab Momennia (UMSNH)
The dark matter-black hole interaction is modeled with the help of the accretion of a Vlasov gas into a rotating Kerr black hole. We provide exact analytic expressions for the particle, mass, and angular momentum accretion rates in the form of integrals. These integrals are computed numerically and compared to more explicit relations in the slow-rotation approximation. The explicit analytic...
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Mabel Osorio (IA-UNAM)Talk
The High Altitude Water Cherenkov (HAWC) Observatory is a wide-field water Cherenkov detector (WCD) that continuously monitors the gamma-ray sky in the energy range from hundreds of GeV to beyond 100 TeV. After nine years of observations, spanning from 2015 to 2024, HAWC provides measurements on four radio galaxies in the northern hemisphere known to emit at very-high-energy (VHE) gamma rays....
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Adrian William Romero Jorge (Frankfurt Institute for Advanced Studies/Goethe University Frankfurt)Talk
We investigate a dark sector coupled to the Standard Model (SM) through a kinetically mixed dark photon $U$ associated with a new $U(1)'$ gauge symmetry. Kinetic mixing, parametrized by $\varepsilon$, induces an effective coupling to the electromagnetic current, while the dark photon interacts with a stable dark matter (DM) particle $\chi$ through a dark gauge coupling $g_\chi$, defining a...
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Prof. Isarael Quiros (Universidad de Guanajuato)Talk
We develop a formalism for generating solutions of conformal gravity theories. It is based on the result that the only static and spherically symmetric vacuum solutions of conformal general relativity are conformal to the Schwarzschild-de Sitter solution. The relevance of the formalism for the understanding of conformal symmetry, along with its physical and geometrical consequences, is...
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Jesús Astorga-Moreno (Cinvestav)Poster
Moiré theory is a revolutionary alternative arising from solid-state physics that can be extended to gravity, forming a framework called Moiré gravity. The idea behind it is that Einsteinian gravity has a validity limit and must be extended to Moiré gravity, in which the Friedmann equation changes and a new scalar field emerges. In this vein, in this paper, we propose an analytic solution for...
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Prof. David Edwin Alvarez Castillo (UANL)Talk
In this work we present hybrid stars with a superconducting quark matter core covered by a hyperonic nuclear matter. The deconfined phase is modelled within a chirally symmetric density functional approach and follows a first order phase transition via a Maxwell construction from a hyperonic DD2 equation of state. While the hadronic phase is fixed, the range of properties of the quark matter...
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Mauricio Ordoñez-Tehozol (UNAM)Poster
Axion-like particles (ALPs), predicted in extensions of the Standard Model, arise as candidates for cold dark matter. Their coupling to photons in external magnetic fields leads to photon–ALP oscillations, which can affect the propagation of very-high energy gamma rays over astrophysical distances. Such effects may manifest as energy dependent distortions and small-scale irregularities in the...
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Prof. José Rodrigo Sacahui (Universidad de San Carlos de Guatemala)Talk
Several correlations have been proposed as possible pseudo-redshift estimators. Among the most widely used are the Amati correlation, which relates the peak energy (Epeak) of the spectrum — when modeled by a Band function — to the isotropic energy; the Yonetoku correlation, which relates luminosity to the peak energy of the most intense episode of the burst; and the Guiriec correlation, which...
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Luis Damián Anaya Martínez (Instituto de Física, Universidad Nacional Autónoma de México)1Talk
Dark matter constitutes approximately 27% of the total energy content of the Universe, making its nature one of the most important open questions in modern physics. Among the proposed dark matter candidates are Axion-Like Particles (ALPs), hypothetical particles that can couple to photons and undergo photon–ALP oscillations in the presence of magnetic fields over astrophysical distances....
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Claudio Salas Pérez (CINVESTAV)Poster
The hypothesis that the Universe is permeated by a cosmological background of gravitational waves has gained increasing interest in theoretical cosmology. In this context, the CMaDE model proposes that dark energy can be understood as a dynamical contribution associated with the gravitational-wave background, whose characteristic scale is linked to the cosmological evolution of the horizon. In...
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Iván Hernández Garibay (Goethe University Frankfurt)Talk
Understanding the extreme conditions inside neutron stars represents a
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major challenge for Astrophysics. Here I present our investigation on
the behaviour of curvature invariants for a large ensemble
of neutron stars built with equations of state (EOSs) that satisfy
constraints from nuclear theory and perturbative QCD, as well as
measurements of neutron-star masses, radii, and... -
OWEN BEUKES (North West University)Talk
Using high resolution RSS longslit data recently obtained from SALT, we have obtained the mass distribution in a nearby gas-rich dwarf galaxy - UGCA 014. In this talk, I will present the first rotation curve for this galaxy derived from its Hβ ionized gas component. I will show that the rotation curve exhibits a steep rise in the inner kiloparsec, reaching a velocity of ∼42 km/s, and remains...
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Dr ERI ATAHUALPA MENA BARBOZA (Centro Universitario de la Ciénega, Universidad de Guadalajara)Talk
We present the implications of incorporating noncommutativity into f(R) gravity. In particular, we explore the proposed framework in a flat FRLW background. We introduced a deformation in a 2n-dimensional phase space.
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Rifah Anjum Priti (University of Rajshahi)Poster
The mass-radius relationship of exoplanets provides a fundamental connection between their observable characteristics and internal structure. In this study, we develop a comprehensive framework in order to derive key planetary parameters, including surface gravity, mean density, escape velocity, moment of inertia, spin period and atmospheric scale height, directly from mass and radius...
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Ms Mayte Castillo Alarcon (Cinvestav)Poster
This work implements a novel method to analyze the structure of a system composed of a Schwarzschild black hole and a dark matter halo modeled as an anisotropic fluid, while ensuring that the proposed metric constitutes an exact solution of the Einstein field equations. Numerical results show that the connection between the temporal and radial metric functions preserves an inverse...
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Dr Fábio Köpp (Universidade Federal de Santa Catarina)
Determining an equation of state (EOS) consistent with astronom-
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ical observations is one of the main challenges in astrophysics. In this
work, we employ the vector MIT bag model, characterized by the pa-
rameters GV (vector coupling) and Bag, to generate mock data. These
data are used to train a deep neural network model — a Bidirectional
GRU — to learn the relationship between... -
Navya Saraswat (Tata Institute of Fundamental Research)Talk
We investigate the environmental dependence of active galactic nucleus (AGN) activity using a stellar mass-complete sample of 36,000 galaxies from the Galaxy and Mass Assembly (GAMA) survey overlapping with the eROSITA Final Equatorial Depth Survey (eFEDS) field. By combining
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X-ray observations from eROSITA, optical and infrared photometry from Legacy Survey and WISE, UV data from GALEX, and... -
Prof. Samir Mandal (Indian Institute of Space Science & Technology)Poster
Accretion onto stellar-mass black holes in X-ray binaries produces diverse spectral and temporal behaviour across the electromagnetic spectrum. The ultraviolet (UV) and X-ray bands are particularly powerful diagnostics, directly probing the outer accretion disk, the hot inner flow and corona, and disk–wind interactions.
In this work, we present a comprehensive UV–X-ray spectral study of...
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Ana Laura García-Perciante (Universidad Autónoma Metropolitana)Talk
Relativistic fluid theories derived from kinetic theory provide a consistent framework for describing transport processes in out-of-equilibrium systems. In this context, first-order perturbative solutions of the relativistic Boltzmann equation lead to constitutive equations that couple dissipative fluxes to both spatial and temporal derivatives of the state variables, as well as to the...
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Sergio Hernández Cadena (SJTU)Talk
Galaxy clusters are the largest gravitationally-bounded systems in the Universe. In these objects, the dark matter (DM) represents almost 85% of their content, while ~5% are galaxies and the rest corresponds to hot gas filling the Intra Cluster Medium (ICM). If the DM is a heavy particle like the Weakly Interactive Massive Particles (WIMPs), galaxy clusters are exceptional targets to...
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Jorge Yahir Mio Pacherre (Instituto de Ciencias Nucleares UNAM)Poster
We study the dynamical stability properties of these charged Proca stars (constructed in Mio and Alcubierre,2025) by adding a small but finite perturbation to the original stationary configurations, and then performing numerical evolutions while keeping the spherical symmetry. We show that, for any given family, the parameter space can be separated into three regions corresponding to...
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Frederic LassiailleTalk
We present recent developments of a corrected relativistic framework based on a structural re-examination of the spacetime–energy coupling in General Relativity. The approach replaces the standard static description of matter with a fully dynamical representation of energy, leading to additional first-order structural contributions in the Einsteinian formulation.
A recent technical advance...
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Paulo Yair Hurtado Domínguez (CINVESTAV)Talk
We study the entropy of various physical systems, seeking an informational characterization of it and its evolution. We use the relationship bettwen entropy and uncertainty to show how non-relativistic quantum mechanics can be derived from Boltzmann entropy, and we extend this treatment to the Schwarzschild metric.
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Juan Zaldívar (INAOE)Talk
Magnetized equilibrium accretion discs are the standard initial condition for general-relativistic magnetohydrodynamic (GRMHD) simulations of black-hole accretion, including those used to interpret Event Horizon Telescope images of M87 and Sgr A. These configurations are stationary by construction and are therefore commonly assumed to be straightforward to evolve numerically. Using the BHAC...
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Dr Ignacio Abraham Sarmiento Alvarado (CINVESTAV)Talk
In this work, we obtain exact solutions to the (n + 2)-dimensional Einstein Field Equations with a non-zero cosmological constant for n > 1. These solutions depend on a set of pairwise commuting constant matrices in sl(n,R) and on a constant matrix in SL(n,R). As examples, we show how to obtain the de Sitter metric, the Anti-de Sitter metric, the Birmingham metric, the Nariai metric and the...
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Emmanuel Chávez Nambo (Universidad Michoacana de San Nicolás de Hidalgo)Talk
In this talk, we will present the rigorous proof of existence of ground states for the Schrödinger-Poisson system, which model rotating boson stars. The model reduces to minimizing an energy functional under an ansatz with $SO(2)$ symmetry.
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The main analytical challenge is the loss of compactness typical of Sobolev embeddings in $\mathbb{R}^3$. Using the concentration-compactness principle,... -
Hector Olivares (Universidade de Aveiro)Talk
The image of a black hole (BH) in an optically thin environment is expected to be characterized by a dark central region surrounded by a bright ring of a characteristic size. The BH shadow and the photon ring are believed to play an important role in producing these features, both of which are observed in horizon-scale images of supermassive BH candidates. In this talk, we show that a...
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Prof. Leonardo Sánchez Hernández (Sánchez Hernández UAM-I)Talk
The Fermi Bubbles are two approximately symmetric, lobe-shaped gamma-ray-emitting structures extending above and below the Galactic disk of the Milky Way, roughly along its rotation axis, to distances of about 9 kpc. Despite their discovery in 2010, their origin and formation history remain unclear. Leading proposed scenarios include outflows driven by past AGN activity and supernova feedback....
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Prof. Gh. Saleh (Saleh Research Centre)Poster
This paper presents an alternative interpretation of photon energy differences within the framework of Saleh Theory and proposes a thermal approach for spectral detection. Unlike the conventional view that relates photon energy directly to frequency through Planck’s equation, this work focuses on a physical explanation based on differences in photon trajectories.
The theory assumes that...
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Sergio MendozaTalk
I present a relativistic modified gravity theory based on a scalar function of the torsion tensor. In the weak-field limit, the field equations naturally reduce to the deep-MOND regime without introducing dark matter. This framework simultaneously reproduces the observed deflection of light across individual galaxies and clusters, and yields an exact derivation of the baryonic Tully-Fisher...
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Dr Kirill A. Balygin (P.N. Lebedev Physical Institute, Russian Academy of Sciences)Poster
The radio-loud active galactic nuclei having the radio emission arising from a core region rather than from lobes are often referred to as "blazars" and include Flat Spectrum Radio Quasars and BL Lacertae objects. The powerful extragalactic source of radio emission 4C+51.37 is a distant flat-spectrum radio quasar at redshift z = 1.375. It has shown high activity since 2000. 4c+51.37 is a...
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Santiago González Salud (Faculty of Physical and Mathematical Sciences - Benemérita Autonomous University of Puebla)Talk
Water H$_2$O megamasers in sub-parsec circumnuclear disks provide geometric constraints from VLBI sky positions, line-of-sight frequency shifts $z$, and---when monitored---their secular drifts. We present a geometry-first forward model for equatorial maser disks in a generic static, spherically symmetric (SSS) spacetime written in Schwarzschild gauge. The construction is formulated on the...
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Alejandro Farid Cantun Estrella (Independent Researcher)Talk
We investigate quantum vacuum effects for a massless scalar field propagating on a one-parameter family of isotropic ultrastatic spacetimes containing two exact solutions of the $(n+1)$-dimensional Einstein field equations: a scalar-flat ultrastatic vacuum and a constant-curvature geometry. Using spectral zeta-function regularization, we evaluate the one-loop effective action associated with...
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Nayeli Marisol Jimenez Cruz (Swansea University)Talk
This is a new test of modified gravity using gravitational-wave experiments, based on three-point correlation functions of the stochastic gravitational-wave background. While standard analyses focus on tensor polarisations predicted by General Relativity, many alternative theories allow additional scalar modes. We show that bispectrum-based observables provide a robust way to isolate these...
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Greco Peña (Universidad de Valparaíso)Talk
Galaxy clusters are key tracers of the large-scale structure of the Universe and powerful probes of cosmology. However, identifying clusters directly in redshift space remains challenging because peculiar velocities distort their apparent distribution, producing anisotropic structures such as Finger-of-God elongations and coherent infall. In this talk, I will present preliminary results from a...
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Valeria Herrera Tinoco (Instituto de Ciencias Físicas- UNAM)Poster
This work aims to implement likelihood profile techniques within the SimpleMC framework as a frequentist approach to cosmological parameter estimation. The method consists of fixing a parameter of interest while doing MLE with respect to the remaining free parameters, allowing the construction of one-dimensional likelihood profiles. To improve the efficiency of the parameter exploration,...
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Santiago González Salud (Faculty of Physical and Mathematical Sciences - Benemérita Autonomous University of Puebla)Poster
VLBI maps of H$_2$O megamaser disks often display a curved (``warped-looking'') locus of maser spots on the sky. We show that such a morphology can arise as a purely geometric projection effect, without invoking an intrinsically warped disk. To this end we develop a non-equatorial, finite-distance Gauss--Bonnet construction for null-ray propagation in a general static, spherically symmetric...
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Dr Vera Y. Sinitsyna (P.N. Lebedev Physical Institute, RAS)Talk
Extragalactic background light (EBL), formed by the light radiated and re-radiated by stars, galaxies, and active galactic nuclei throughout the evolution of the Universe, brings the imprint of the history of the rate of formation of emitting astrophysical objects and the universe expansion. It makes EBL one of the fundamental quantities in cosmology. Optical depth for high-energy emission...
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Erick Alejandro Rangel (Instituto de Astronomía, UNAM)Talk
The High-Altitude Water Cherenkov (HAWC) Observatory is located on the slopes of Sierra Negra volcano in Mexico at an altitude of 4,100 m above sea level. HAWC is a wide-field-of-view detector designed to observe very-high-energy (VHE) gamma rays in the energy range from hundreds of GeV to beyond 100 TeV, while operating with a duty cycle greater than 95%. Since the start of full operations in...
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Rafael Gutiérrez Balboa (Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional)Poster
Studying the matter distribution in the universe through the Lyman-α forest allows us to constrain small-scale physics in the high-redshift regime. Spectroscopic quasar surveys are generating increasingly large datasets that require efficient algorithms to compute correlation functions. Moreover, cosmological analyses based on Lyman-α forests can significantly benefit from incorporating...
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Prof. Aurora Pérez Martínez (Universidad de La Habana)Talk
Strong magnetic fields and exotic phases of dense matter are expected to play a fundamental role in determining the internal composition and global properties of compact stars. Among the possible constituents of matter at supranuclear densities, Bose-Einstein condensates (BECs) of bosonic particles provide an attractive scenario for describing the interiors of neutron stars and other compact...
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Prof. Miguel García Aspeitia (Universidad Iberoamericana)Talk
In this talk, I will discuss an interesting model that can be detected directly through gamma-ray emission, producing a signal that can be detected in future experiments. Additionally, we discuss a model that produces an accelerating phase without the necessity of a dark energy component, only breaking the symmetry of homogeneity.
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Dr Sergey S. Borisov (P.N. Lebedev Physical Institute, RAS)Talk
IC 443 is a middle-aged SNR whose age, however, is estimated with high uncertainty to be from 3 to 30 10 3 years. IC 443 shows signs of interaction of SNR shells with surrounding molecular clouds and may also be overlapping with the older SNR G189+3.3. IC 443 has been intensively studied through multiwavelength observations in radio, X-rays, and MeV-TeV energy ranges, which aimed to reveal the...
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Prof. Thomas Boller (Garching MPE)Talk
Their X-ray spectra are characterized by a prominent soft excess below 2 keV, typically interpreted as warm Comptonization from the inner accretion disk atmosphere or relativistic reflection. In the harder 0.7-10 keV band, NLS1s exhibit steeper power-law photon indices (Gamma > 2.5) than traditional broad-line AGN. Because of their lower central masses, they show rapid, high-amplitude X-ray...
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Eder Leoni López (UNAM)Poster
Once a massive star exhausts its nuclear fuel, the core collapses under its own gravity leading to the ejection of matter and, eventually, to the formation of a compact object known as a proto-neutron star. Under the extreme conditions (pressure, temperature, density), particle production through weak-interaction processes is favored, mainly via the direct Urca process, which results in the...
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Omar Elias Velasco-Castillo (Universidad Nacional Automoma de Mexico)Talk
Type II supernovae explosions are one of the most energetic outflows in the Universe. The neutrino driven collapse of the iron core of supergiant stars is regarded as the most efficient mechanism for explaining the high luminosities in these events. In this talk, we will discuss two different scenarios after the collapse. The first one is a failed supernova forming a proto neutron star that...
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Daniel Lluis Gonzalez (Goethe University Frankfurt)Poster
We explore the impact of the equation of state (EoS) on heavy-ion collision observables using a Chiral Mean Field (CMF) framework constrained by astrophysical and lattice-QCD inputs. By varying the relative vector and scalar–vector couplings of $\Delta$ resonances and the scalar $\sigma$ field with respect to nucleons, we identify a family of EoS that simultaneously reproduce neutron stars...
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Amritpal Singh Nafria (Lamrin Tech Skills University)Poster
As the Sun advances toward the red giant branch, secular changes in luminosity, mass loss, and tidal interactions will progressively reshape the inner solar system. The innermost terrestrial planet, subject to orbital decay and thermal runaways, will experience conditions incompatible with structural integrity. This event precipitates a realignment of orbital and thermal states among the...
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Himanshi Gulia (Netaji subhash university of technology)Poster
The Event Horizon Telescope images of M87 and Sgr A give us a unique chance to test gravity in the strong field regime and assess deviations from the Kerr solution. We study the shadows of rotating nonsingular black holes—namely, generalized Ghosh black holes (GGBHs), given by the mass function $m(r) = M e^{-(k/r)^n}$, which reduces to the Kerr black hole ($k \to 0$) and to the original...
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Cynthia Ahiezer Vizcarra Ventura (Universidad Continental)Talk
Magnetars are natural laboratories to study matter under very strong magnetic fields at high densities. These extreme fields can modify the microscopic structure of matter by incorporating the idea of the Landau levels, which immediately the equations of state possibly triggering a phase transitions at the stellar cores. However, a full understanding of the interaction between magnetic fields...
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Hamidreza Moshfegh (University of Tehran)Talk
Neutron stars provide a unique astrophysical laboratory for probing dark matter under extreme density and strong gravity. Motivated by dark-sector interpretations of the neutron lifetime anomaly, we investigate neutron-to-dark-matter conversion in dense neutron-star matter and its impact on the equation of state and stellar observables.
We model baryonic matter within a non-linear...
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Ethan Carlier (Université Libre de Bruxelles)Poster
White dwarfs offer a unique laboratory for studying matter under strongly coupled and partially degenerate conditions. With the upcoming space‑based gravitational‑wave detectors, such as LISA, binary white dwarfs will become a major source of continuous gravitational‑wave signals. These observations will open a new window onto the internal physics of white dwarfs, providing access to...
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Prof. Vera G. Sinitsyna Sinitsyna (P.N. Lebedev Physical Institute, Russian Academy of Sciences)Talk
Cyg X-3 is the famous galactic High-Mass X-ray binary system formed by a black hole that orbits a massive Wolf-Rayet star. Huge radio-flares are accompanied by the ejection of powerful jets like those seen in active galactic nuclei, making Cyg X-3 a microquasar-type object. Moreover, the activity of these jets is correlated with X-ray states. The X-ray and infrared emission from Cyg X-3 are...
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38. Quantitative VHE Transient Detection Prospects for the Southern Wide-field Gamma-ray ObservatoryPedro Elías Mirón Enríquez (Instituto de Astronomía, UNAM)Talk
We present a systematic and quantitative assessment of the Southern Wide-field Gamma-ray Observatory's (SWGO) detection rates for very-high-energy (VHE; >100 GeV) transient sources. Using the SWGO instrument response functions — including effective area, background rates, and point-spread function across three zenith-angle bands and three core-distance bands — we construct spectral templates...
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44. Quantitative VHE Transient Detection Prospects for the Southern Wide-field Gamma-ray ObservatoryPedro Elías Mirón Enríquez (Instituto de Astronomía, UNAM)Talk
We present a systematic and quantitative assessment of the Southern Wide-field Gamma-ray Observatory's (SWGO) detection rates for very-high-energy (VHE; >100 GeV) transient sources. Using the SWGO instrument response functions — including effective area, background rates, and point-spread function across three zenith-angle bands and three core-distance bands — we construct spectral templates...
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Prof. Diego Galdames Rojas (Universidad Central de Chile)Talk
We present analytical and numerical models of linear radial pulsations in stellar structures with parameters representative of evolved stars in selected globular clusters. Motivated by recent observations of short-period, low-amplitude variables in NGC 3201 and NGC 6397, this work investigates whether linear adiabatic radial oscillations can reproduce the observed period ranges of these...
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Prof. Leonel de la Cruz BixanoTalk
This talk presents new exact rotating wormhole solutions in Einstein Maxwell–Dilaton (and Phantom) gravity. Their geometric structure, causal properties, traversability, tidal forces, electromagnetic fields, and the role of Wormhole Cosmic Censorship are discussed, providing physically viable wormhole configurations.
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57. Relativistic Bondi–Hoyle–Lyttelton Accretion with Realistic Equations of State in HUASTECO code.Rodrigo Anaya (Instituto de Astronomía, Universidad Nacional Autónoma de México)Talk
Title: Relativistic Accretion with a Realistic Equation of State using HUASTECO code.
Abstract: We present relativistic Bondi--Hoyle--Lyttleton accretion with realistic equations of state using the HUASTECO code. The system consists of a black hole moving supersonically
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through a gaseous medium, forming an accretion shock cone. The main goal is to study more realistic accretion scenarios... -
Olivier Sarbach (Universidad Michoacana de San Nicolás de Hidalgo)Talk
We discuss a new dissipative fluid theory on an arbitrary (flat or curved) spacetime background. This theory is obtained from kinetic theory by applying a new version of the relativistic Chapman-Enskog method to derive the constitutive relations to first order in the Knudsen parameter. The novelty of our approach consists in applying a suitable projection method to solve the linearized...
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Dr Félix Salazar (Universidad Autónoma Metropolitana (UAM))Talk
In this talk, we present a first-order theory of relativistic dissipative fluids formulated in the trace-fixed particle frame; a variant of Eckart's frame in which the temperature is determined by fixing the trace of the stress-energy tensor. We show that the resulting theory is hyperbolic and causal provided that a single inequality is satisfied. We also prove that global equilibrium states...
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Emilio Tejeda (Instituto de Física y Matemáticas, UMSNH)Talk
We present the Hybrid Relativistic-Newtonian Approximation (HRNA), a novel and computationally efficient framework designed to simulate the dynamics of self-gravitating systems orbiting within a fixed, curved background spacetime. The HRNA operates at the intersection of two physical regimes: the global motion follows exact general relativistic geodesics in a black hole metric, while the...
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Dr Vesselin Gueorguiev (NCIS, RIIS 2.0, and IAPS)Talk
The nature of dark energy (DE) challenges our comprehension of the cosmos, appearing as the source responsible for the Universe’s accelerating expansion. This work considers the Einstein Cosmological Constant (ΛE) as a manifestation of DE, interpreted through the lens of Reparametrization Invariant Scaling Symmetry (RISS). Within this paradigm, ΛE emerges as a “kinetic energy” term, derived...
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Edgar Alejandro León Espinoza (Universidad Autónoma de Sinaloa)Talk
We start by examining the relations between the Kruskal representation and stereographic projection. Motivated by novel results in spherically-symmetric metrics, we explore the analogue of conformal-Minkowski mappings. To this end, we introduce 'Diamond Coordinates,' a compactified representation that naturally delineates local causal diamonds. By analyzing the worldlines of observers within...
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Sebastián Nájera (ICF UNAM)Talk
We present a fully relativistic treatment of cosmological peculiar velocities within General Relativity, moving beyond the standard Newtonian approximation commonly employed in large-scale structure studies. Peculiar velocity fields are derived from analytic solutions of Einstein’s equations sourced by non-perfect fluids and interpreted through frame transformations with respect to a...
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Dr Sebastián Nájera (ICF-UNAM)Talk
We present a fully relativistic treatment of cosmological peculiar velocities within General Relativity, moving beyond the standard Newtonian approximation commonly employed in large-scale structure studies. Peculiar velocity fields are derived from analytic solutions of Einstein’s equations sourced by non-perfect fluids and interpreted through frame transformations with respect to a...
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Muhammad Awais (ESFM - Escuela Superior de Física y Matemáticas - IPN)Poster
We investigate the cosmological viability of quadratic scalar field dark matter (SFDM), also known as fuzzy, wave, or ultralight dark matter, where the dark matter sector is modeled as a single ultra-light scalar field with potential
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[
V(\phi)=\frac{1}{2}m_\phi^2\phi^2 .
]
The scalar-field background evolution and linear perturbations are implemented in a modified version of the... -
Alexis Andrés (IA-UNAM)Talk
Gamma-ray bursts (GRBs) are among the most energetic phenomena in the Universe. Their emission typically consists of a brief prompt phase observed in the sub-MeV energy range, followed by a delayed and longer-lasting afterglow detected across the electromagnetic spectrum. In a few cases, GRB afterglows have also been observed at TeV energies, from minutes to several hours after the trigger...
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Joanne Michelle Rodríguez Romo (Universidad Nacional Autónoma de México)Talk
Gamma-ray bursts (GRBs) are the most energetic phenomena in the Universe since the Big Bang, typically emitting radiation in the energy range from tens of keV to hundreds of MeV during their prompt phase. On October 9, 2022, GRB 221009A was detected and identified as the brightest GRB ever observed, distinguished by the detection of photons with energies up to 13 TeV, as reported by the LHAASO...
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Alejandro Cruz Osorio (Goethe University)Talk
Relativistic jets are launched in the immediate vicinity of black holes and emit radiation across the entire electromagnetic spectrum. According to our current understanding, these powerful outflows are driven by extracting rotational energy from spinning black holes via the Blandford–Znajek mechanism. Numerical simulations have further demonstrated that the accumulation of magnetic flux onto...
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CESAR AUGUSTO Zen Vasconcellos (UFRGS/ICRANet)Talk
abstract. Spacetime singularities represent fundamental limitations of classical gravity that require quantum resolution. We develop a dual geometric-dynamical framework combining: (1) anisotropic scaling for ultraviolet completeness and (2) pseudocomplex geometry for singularity resolution. This unified approach achieves simultaneous renormalizability, geodesic completeness, and unitary...
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Dr Edilberto Aguilar Ruiz (Instituto de Radioastronomía y Astrofísica, UNAM)Talk
Recent detections of very high-energy (VHE; $E > 100$\,GeV) emission from gamma-ray burst (GRB) afterglows have highlighted the need for accurate synchrotron self-Compton (SSC) models. Although numerical approaches provide a realistic description of the underlying radiation processes, their high computational cost makes them impractical for conventional parameter estimation methods such as...
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148. The Dynamic Landscape of Ultralight Bose-Condensate Dark Matter from Galactic Halos to VorticesProf. Francisco Siddhartha Guzman Murillo (Francisco Siddhartha Guzman Murillo IFM-UMSNH)Talk
We present a multi-scale analysis of ultralight Bose-Condensate Dark Matter (BECDM). In a first scenario we study the case of the BECDM alone, and start with the construction of non-spherical BECDM halos using multimode expansions, demonstrating that a core-envelope structure effectively recovers the rotation curves of LSB galaxies, the quantum effects of a halo are discussed from the core to...
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Xavier Dupac (European Space Agency)Talk
Euclid is European Space Agency’s space telescope dedicated to cosmology, through two main probes: weak lensing and galaxy clustering. It was launched in July 2023 and is now in its third year of survey. It is performing a large photometric and spectroscopic survey of galaxies over 14000 sq. deg. of the Extragalactic sky (Wide Survey), as well as a Deep Survey of three areas of the sky (53 sq....
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Prof. Cesar Augusto Zen Vasconcellos (ICRANet), Prof. Fridolin Weber (University of California at San Diego), Leila Maghlaoui (Mentouri Univeristy), Peter HessTalk
The pseudo-complex version of the Friedmann–Lemaître–Robertson–
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Walker model (pcFLRW) is presented within the framework of pseudo-complex
General Relativity (pcGR). In this approach, dark energy arises as a geometric
consequence of the pseudo-complex structure, leading to a time-dependent
Hubble parameter H(z), which at the present time yields a value H0 and, crucially,
a non-zero time... -
Prof. Peter Otto Hess (UNAM, FIAS)Talk
The pseudo-complex version of the Friedmann–Lemaître–Robertson–Walker model (pcFLRW) is presented within the framework of pseudo-complex General Relativity (pcGR). In this approach, dark energy emerges as a geometric consequence of the pseudo-complex structure, leading to a specific functional form for the Hubble parameter H(z) characterized by a single geometric parameter beta. This parameter...
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CESAR AUGUSTO Zen Vasconcellos (UFRGS/ICRANet)Talk
abstract. The Thirteen Towers of Chankillo (fourth century B.C.E., coastal Peru) form a calibrated solar observatory whose visual span of 47◦ exactly matches the Sun’s annual declination range. This correspondence is not a coincidence of natural topography but the result of deliberate architectural design: the towers are positioned along a gently curving ridge at a fixed distance of...
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Ethan Carlier (Université Libre de Bruxelles)Talk
The observation of the gravitational-wave signal GW170817 from a binary neutron-star merger marked the beginning of a new era in astrophysics. Such events offer unique opportunities to probe the properties of matter under conditions so extreme that they cannot be reproduced in terrestrial laboratories. During the inspiral phase, neutron stars undergo slight deformations induced by the tidal...
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Muhammad Ghulam Khuwajah Khan (Indian Institute of Technology, Jodhpur)Poster
The microscopic identity of dark matter and the smallness of the observed vacuum energy remain two central puzzles in cosmology. I present a framework in which both questions are tied to a single additional gauge sector. In four spacetime dimensions, a three-form gauge field has a four-form field strength with no local propagating degrees of freedom. Instead, it labels distinct vacuum-energy...
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Sara Mercedes Fraija Castellanos (Universidad Nacional Autónoma de México)Talk
Short gamma-ray bursts (sGRBs) are produced during the merger of compact-object binaries, launching collimated ultrarelativistic jets that generate prompt gamma-ray emission. These events are also expected to produce an approximately isotropic infrared/optical signal rich in lanthanides, known as a kilonova. To date, only a few sGRBs have been associated with kilonova emission, primarily due...
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Ms Sara Fraija Castellanos (Instituto de Astronomía, UNAM)Poster
Short gamma-ray bursts (sGRBs) are produced during the merger of compact-object binaries, launching collimated ultrarelativistic jets that generate prompt gamma-ray emission. These events are also expected to produce an approximately isotropic infrared/optical signal rich in lanthanides, known as a kilonova. To date, only a few sGRBs have been associated with kilonova emission, primarily due...
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Tula Bernal (Universidad Autónoma Chapingo)Talk
Observations have confirmed that satellite galaxies of the Milky Way, as well as those of Andromeda and Centaurus A, exhibit a non-homogeneous distribution known as the Vast Polar Structure (VPOS), where satellites show orbits aligned perpendicular to the host galaxy's plane. Conventional Cold Dark Matter (CDM) models face significant challenges in explaining this anisotropic distribution...
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Mr Lam Hui (Columbia University)Poster
We will discuss the possibility that dark matter is composed of particles lighter than about 10 eV, in which case, the dark matter galaxy halo is best thought of as a set of waves. The astrophysical consequences, and the experimental implications for axion detection, will be discussed.
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Sarahí Silva García (Universidad Nacional Autónoma de México)Poster
In this work, we demonstrate that identifying the matter Lagrangian with the pressure leads to physical inconsistencies, which are resolved when the fluid is coupled to the gravitational field. In such a scenario, the matter Lagrangian necessarily assumes the value ofthe total energy density. We thus conclude that, for an ideal fluid, the only physically consistent choice for the matter...
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