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Javier Mejuto (Universidad Nacional Autónoma de Honduras)05/09/2022, 09:00Talk (in-person)
The use and appropriation of common spaces, public spaces, and indigenous lands have become frequent and normalized, unfortunately this is also true for Astronomy, Astrophysics and Space Sciences. In this work, the indigenous concerns and social movements regarding sacred lands and astronomical facilities that have been built upon them will be presented. The joint initiative IAU/RAS/AAS...
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Steven Gullberg (University of Oklahoma)05/09/2022, 09:20Talk (in-person)
The great Maya city of Tikal was a major center of political, economic, and religious influence from its earliest pre-classic foundations to its classic period heights-- through its fall and reestablishment, until its eventual abandonment. Like many other polities of the ancient Maya, Tikal’s city-planning and architectural organization was designed to incorporate the beliefs and principles of...
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Tonatiuh Matos05/09/2022, 09:40Talk (in-person)
Two of the most impressive open questions in science are, without a doubt, the discovery of the nature of Dark Matter and Dark Energy, the so-called Dark Universe. Scientists have worked to solve these questions for many years, decades. Quantum Mechanics (QM) was established to understand the microworld, atoms, molecules, etc. Since 1998 we have carried out a systematic study of the Scalar...
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Elena Bratkovskaya05/09/2022, 10:00Talk (in-person)
The vector $U$-bosons, or so called 'dark photons', are one of the possible candidates for the dark matter (DM) mediators. They are supposed to interact with the standard matter via a 'vector portal' due to the $U(1)-U(1)^\prime$ symmetry group mixing which might make them visible in particle and heavy-ion experiments. While there is no confirmed observation of dark photons, the detailed...
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Remo Ruffini (ICRANet)05/09/2022, 10:30Talk (in-person)
In this contribution we present the most recent results about the role of a standard family of Supernovae in the creation of the BdHNI , BDHNII and BDHNIII Grbs. Some important conclusions and open questions are addressed.
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Mariana Vargas Magana05/09/2022, 11:20Talk (virtual)
The Dark Energy Spectroscopic Instrument is a fourth generation dark energy experiment which will revolutionate the cosmological constraints that we can extract from the large scale structure of the universe. DESI started to take data in 2020, and now it just finished the September this first year of data. In this talk, I will summarize the survey, present the status of the experiment and give...
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György Wolf (Wigner RCP)05/09/2022, 11:40Talk (virtual)
The existence of quark matter inside the cores of heavy neutron stars is a possibility which can be probed with modern astrophysical observations. We use an (axial)vector meson extended quark-meson model to describe quark matter in the core of neutron stars. We discover that an additional parameter constraint is necessary in the quark model to ensure chiral restoration at high densities. Since...
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Matthias Hanauske05/09/2022, 12:00Talk (virtual)
With the first detection of gravitational waves from a binary system of neutron stars GW170817, a new window was opened to study the properties of relativistic fluids at and above the nuclear-saturation density. Reaching densities a few times that of nuclear matter and temperatures up to 100 MeV, such mergers also represent potential sites for a phase transition from confined hadronic matter...
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David Blaschke05/09/2022, 12:20Talk (virtual)
We outline the role that an early deconfinement phase transition from normal nuclear matter to a color superconducting quark-gluon plasma phase plays for the phenomenology of supernova explosions and binary neutron star mergers. To this end we develop a density functional approach to the equation of state (EoS) of quark matter with confinement and color superconductivity [1] and construct the...
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Omar Gallegos (Departamento de Física, Centro de Investigación y de Estudios Avanzados del IPN)05/09/2022, 14:30Talk (in-person)
The current acceleration of our Universe leads to the question of a possible origin of a cosmological constant. Within loop quantum cosmology a recent proposal yields an effective model including a behavior corresponding to it which origin lies in the relative weight of two pieces entering the Hamiltonian constraint, Euclidian and Lorentzian. Matching with the observations essentially fixes...
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40. Effect of the Metallicity of the Intergalactic Medium in the Lyman-α Forest Correlation FunctionAndrea Muñoz-Gutiérrez05/09/2022, 14:50Talk (in-person)
The Lyman-α (Lyα) forest allows to constraint cosmological parameters at z>1.8 using the technique of standard rulers determined by Baryon Acoustic Oscillations (BAO). This makes it an important tracer for the study of the Universe at high redshift. For this work several synthetic datasets have been generated to understand the astrophysical effects and contaminants that contribute to the shape...
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Sergio Mendoza (Instituto de Astronomia, Universidad Nacional Autonoma de Mexico)05/09/2022, 15:10Talk (in-person)
It is shown how in general terms one can construct a curvature energy-momentum tensor in extended theories of gravity with particular attention to gravitational theories with curvature-matter couplings for ideal fluids. In passing by, it will also be shown a unique way to define the matter Lagrangian for the case of ideal fluids.
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Alexis Andrés (IA-UNAM)05/09/2022, 15:30Talk (in-person)
TeV halos are a new class of extended gamma-ray objects recently discovered around middle-aged pulsars. Although it is still unclear if TeV halos are characteristics of all pulsars, their population in the Milky Way galaxy has been studied. In this work, we study the TeV halo population in the Andromeda galaxy (M31), the closest largest spiral galaxy to the Milky Way. Concretely, we assume M31...
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Alejandro Raga05/09/2022, 15:50Talk (in-person)
It has been noted before that the observed spiral structure of free-streaming, precessing jets appears to be increasingly "rotated" (i.e., with an apparent increase/decrease of the angle between the precession axis and the plane of the sky) as v/c increases. We derive the value of the rotation angle, and show that this "rotated spiral" description is appropriate for jets with v/c<0.8. We find...
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Sanghati Saha (Amity University Kolkata)05/09/2022, 16:10Talk (virtual)
Here, We will be reporting a study on Generalized Chaplygin Gas(GCG) in bulk viscosity framework. We have reconstructed f(T) gravity considering that the background fluid, is evolving as GCG interacting with pressureless dark matter in a viscous scenario. Stability of reconstructed f(T) has been analyzed against small purterbations. The model has been finally validated against observational...
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Hernán Asorey06/09/2022, 09:00Talk (in-person)
The Latin American Giant Observatory (LAGO) is an extended astroparticle observatory, consisting of a synchronised network of water Cherenkov detectors operating in Latin America and covering a wide range of altitudes above sea level and geomagnetic rigidity cut-offs[1]. LAGO is operated by the LAGO Collaboration, a highly collaborative organization with 100 members from more than 30...
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Rafael Mayo-García (CIEMAT)06/09/2022, 09:20Talk (in-person)
Atmospheric radiation is mainly produced during the interaction of high energy cosmic rays with the atmosphere. After the first interaction of these primary cosmic rays, a series of radiative and decay processes generate a collective process known as Extensive Air Shower (EAS), with up to 10 secondary particles per primary per GeV at the altitude of the maximum development, and continue...
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Eugene Oks (Auburn University)06/09/2022, 09:40Talk (in-person)
The review will cover the latest advances in understanding dark matter. At the beginning it will follow my review on dark matter published in 2021 in the Elsevier journal “New Astronomy Reviews” (v. 93, 101632) and my review published in 2021 by Nova Science Publishers as a chapter in the book “Advances in Dark Matter Research”. Then the current review will cover the newest results published...
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Dorota Rosinska06/09/2022, 10:00Talk (in-person)
An understanding of differentially rotating relativistic stars is key to many areas of astrophysics, in particular to the emission of gravitational waves. A newly born, proto-neutron star or a compact
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remnant of neutron stars binary merger are expected to rotate differentially and to be important sources of gravitational radiation. A highly accurate and stable, relativistic, multidomain... -
Joerg Aichelin (SUBATECH)06/09/2022, 10:30Talk (in-person)
The calculation of neutron star properties as well as the interpretation of the gravitational wave results for neutron star collisions requires the knowledge of the equation of state of strongly interacting matter.
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Relativistic heavy ion collisions have collected over the last years a number of results which are sensitive on the nuclear equation of state and the properties of elementary... -
Shu-Hua Yang (Central China Normal University, Wuhuan, China)06/09/2022, 11:20Talk (virtual)
We find that the existence of strange stars is ruled out by the dimensionless tidal deformability of a 1.4 M_sun star of GW170817 and the mass of PSR J0740+6620 , both for the standard MIT bag model and for the density dependent quark mass model. However, if non-Newtonian gravity effects are considered, strange stars can exist for certain ranges of the values of the non-Newtonian gravity...
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David Edwin Alvarez Castillo (Institute of Nuclear Physics PAS)06/09/2022, 11:40Talk (virtual)
The purpose of this talk is discuss the possibility of detection of dark matter through multiple observations of compact stars and related phenomena. Recent scientific and technological developments have allowed for a better study of the nature of these astrophysical objects, in particular of the equation of state (EoS). As we advance on the quest for clarification of the neutron star internal...
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Carlos Frajuca (IFSP)06/09/2022, 12:00Talk (virtual)
Quantum coherent states is a new features in quantum mechanics. Resonant-mass gravitational waves detectors didn´t succeed in detecting gravitational waves probably because of the operational frequency range chosen when the design of such detectors. But such detectors can be important in the future. This work describe the importance of quantum coherent states when the a resonant-mass...
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David Garrison (University of Houston-Clear Lake)06/09/2022, 12:20Talk (virtual)
The Numerical Cosmology Group at UHCL has been working for several years to develop the most accurate simulations of the Early Universe possible in order to answer several basic questions such as when did the first magnetic fields develop? In addition, our numerical code can be used to test several fundamental theories in physics. In this presentation, I plan to talk about how we developed...
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Milton Jair Santibáñez Armenta06/09/2022, 14:30Talk (in-person)
Gravitational fields curve space-time about them, modifying massive and non-massive particle trayectories. In this work the delfection angle we study the deflection angle generated by the change in the trayecoties affected by the gravitational field of a Schwarzschild space-time. We present an exact analytic formula for small angles and a useful relation for numerical computations. Different...
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Sergio Hernández-Cadena06/09/2022, 14:50Talk (in-person)
Clusters of galaxies are the largest gravitationally-bound structures in the Universe. They are composed of galaxies and gas (~15% of the total mass), and dark matter (DM; ~85%). If the DM is composed of Weakly Interacting Massive Particles (WIMPs), galaxy clusters represent the best targets to search for gamma-ray signals induced by the decay of WIMPs with masses at the TeV scale. Due to its...
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Gustavo Magallanes-Guijón06/09/2022, 15:10Talk (in-person)
In this work, a multifrequency analysis (radio, optical, x-rays, and gamma rays) of the blazar Mrk 501 is presented. We analyze the light curves of this extragalactic object with different computational algorithms (analysis of variance, discrete Fourier transform, periodograms, wavelets transform, among others). With the help of numerical simulations and light curve fitting using elliptic...
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Bryan Larios06/09/2022, 15:30Talk (in-person)
Blazars are a type of Active Galactic Nucley (AGN) which jet points towards the observer. Their emission is variable in different time scales and at different wavelenghts. Some objets presents periodicity in their emission, like the blazar PG 1553+113. In this work we study a scenario to explain blazar periodicities with timescales of few years. The scenario is built on a binary supermassive...
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José Serna-Franco (Instituto de Física - Universidad Nacional Autónoma de México)06/09/2022, 15:50Talk (in-person)
In modern astrophysics, the innovation of new instruments for the detection of high-energy particles is very relevant for the next generation of gamma-ray observatories such as SWGO (Southern Wide-Field Gamma-Ray Observatory). The HAWCS’s Eye telescope is a prototype of a proposed compact wide-field-of-view Imaging Air-Cherenkov Telescope (IACT). It is designed as a SiPM-based 61-pixel...
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Alvaro Pratts (IF-UNAM)06/09/2022, 16:10Talk (in-person)
Even though dark matter constitutes approximately 27$ \% $ of the Universe, it has been impossible to understand its nature and composition. Historically, the most favored candidate has been the WIMPs (Weakly Interacting Massive Particles), with the Supersymmetric neutralino being the most known candidate. However, it has not been observed any supersymmetric particle. Thus other candidates for...
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Radim Pánis (Institute of Physics, Silesian University in Opava)06/09/2022, 16:30Talk (in-person)
We study behaviour of ionized region of a Keplerian disk orbiting a Schwarzschild black hole immersed in an asymptotically uniform magnetic field. In dependence on the magnetic parameter B, and inclination angle θ of the disk plane with respect to the magnetic field direction, the charged particles of the ionized disk can enter three regimes: a) regular oscillatory motion, b)...
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Jose Rodrigo Sacahui Reyes (Universidad de San Carlos de Guatemala)07/09/2022, 09:00Talk (in-person)
The Central American and the Caribbean region has low scientific development indicators. Montero-Camacho et al. 2021 highlights four main factors for these: 1. Absences of Ph.D. programs; 2. Lack of postdoctoral opportunities; 3. Low to none economic incentives and 4. Poor infrastructure. Most of the production in the last 20 years comes from Puerto Rico, the country that hosted the Arecibo...
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Ophir Ruimi07/09/2022, 09:20Talk (in-person)
Neutrons play a dominant role in the stellar nucleosynthesis of heavy elements. We review a scheme for the experimental determinations of neutron-induced reaction cross sections using a high-intensity neutron source based on the 18O(p,n)18F reaction with an 18O-water target at SARAF’s upcoming Phase II. The quasi-Maxwellian neutron spectrum with effective thermal energy kT ≈ 5 keV,...
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Jorge Horvath (IAG-USP)07/09/2022, 09:40Talk (in-person)
The lack of objects between $2$ and $5 \, M_{\odot}$ enter code here in the joint mass distribution of compact objects has been termed "mass gap" and attributed to the characteristics of the supernova mechanism at their birth. However, recent observations show that a number of candidates reported to lie inside the "gap" may fill it, and the paucity may be the result of small number statistics....
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Tsvi Piran (The Hebrew University)07/09/2022, 10:00Talk (in-person)
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Felix Mirabel (IAFE)07/09/2022, 10:30Talk (virtual)
The existence of supermassive black holes (SMBHs) of ∼ 109 solar masses in quasars at z ∼ 7.5, when the Universe was ∼700 Myr old, is an intriguing puzzle because their originremains unconstraint. It have been proposed that those SMBHs result from rapidly growing BH seeds of stellar and/or intermediate masses BHs at redshifts z ∼30. However, there is no consensus on whether such extreme rapid...
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Jürgen Struckmeier (GSI)07/09/2022, 11:00Talk (virtual)
We present a theorem on scalar-valued functions of tensors, where ”scalar” refers to absolute scalars as well as relative scalars of weight w. The theorem thereby generalizes an identity referred to earlier by Rosenfeld in his publication ”On the energy-momentum tensor” and provides a (1,1)-tensor identity which can be regarded as the tensor analogue of the identity following from Euler’s...
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David Vasak (Frankfurt Institute for Advanced Studies)07/09/2022, 11:20Talk (virtual)
A modification of the Einstein-Hilbert theory, the Covariant Canonical Gauge Gravity (CCGG), leads to a cosmological constant that represents the energy of the space-time continuum when deformed from its (A)dS ground state to a flat geometry . CCGG is based on the canonical transformation theory in the De Donder-Weyl (DW) Hamiltonian formulation. That framework “deforms” the Einstein-Hilbert...
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Fernanda Carreon (Instituto de Astronomía, UNAM)08/09/2022, 09:00Talk (in-person)
TeV Halos are regions of extended emission around pulsars, produced due to inverse-Compton scattering of photons by particles accelerated inside and diffused away from the pulsar wind nebulae. TeV Halos, discovered in 2017 by the HAWC Collaboration, represent a possible detection tool for “silent” pulsars, those whose radiation jets are never oriented towards Earth. In addition, TeV Halos are...
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Angel Sánchez (Facultad de Ciencias, Universidad Nacional Autónoma de México)08/09/2022, 09:20Talk (in-person)
In this work we study the consequences a possible primordial magnetic field could have on the inflaton effective potential, taking as the underlying model a warm inflation scenario, based on global supersymmetry with a new-inflation-type potential. In the warn inflation scenario, the decay scheme for the inflaton field is a two-step process of radiation production, where the inflaton couples...
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Antonio Marinelli (Università di Napoli, Federico II)08/09/2022, 09:40Talk (in-person)
Starburst galaxies (SBGs) and more in general starforming galaxies represent a class of galaxies with a high star formation rate (up to 100 Mo/year). Despite their low luminosity, they can be considered as guaranteed “factories” of high energy neutrinos, being “reservoirs” of accelerated cosmic rays and hosting a high density target gas in the central region. The estimation of their point-like...
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Gabriella Piccinelli Bocchi (Universidad Nacional Autónoma de México)08/09/2022, 10:00Talk (in-person)
Cosmological models supported by Lee-Wick theories have the interesting feature of a cosmological bounce that solves the singularity problem. Besides, non-canonical fields, which are present in these theories, may be invoked to provide scenarios of dark energy or inflation. In inflation, some desirable features are present, such that the slow-roll conditions and the tensor- to-scalar...
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Thomas Boller08/09/2022, 10:30Talk (in-person)
A). Ionized Gas Outflows in AGN from the gravitational radius scale up to the kiloparsec scale:
We present the first look to the spectral and timing analysis of Narrow-Line Seyfert 1 Galaxies (NLS1s) with eROSITA based on the SDSS DR12 catalogue. The SDSS DR12 spectral analysis is based on a power-law model using XSPEC fit with a Principal Component Analysis (PCA) background model. The...
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Jennifer Meneses Rizo08/09/2022, 11:20Talk (virtual)
Considering that inflation is the mechanism that introduces the seeds for the formation of structures which distribution is close to Gaussian, generating a universe similar to ours introducing deviations from Gaussianity in the initial conditions could give us information about this inflationary period. In particular, the local primordial non-Gaussianities that generate a scale-dependent bias...
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Alejandro Perez Fernandez (Instituto de Física, UNAM)08/09/2022, 11:40Talk (virtual)
Before the epoch of recombination, the Universe was permeated with a baryon-electron-photon plasma. While gravity gave rise to the collapse of the initial overdensities, the radiation pressure served as a counterforce, thus resulting in the free propagation of sound waves within the primordial plasma. This corresponds to the oscillatory pattern that can be observed in the CMB two-point...
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Manuel Malheiro08/09/2022, 12:00Talk (virtual)
The structure and stability of hot and massive white dwarfs against radial oscillations, pycnonuclear reactions, and inverse β-decay are investigated, We find that the temperature produces importante effects on the equilibrium and radial stability of white dwarfs. The stable equilibrium configuration results are compared with those for white dwarfs estimated from the Extreme Ultraviolet...
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Renxin Xu (School of Physics, Peking University)08/09/2022, 12:20Talk (virtual)
What is the real nature of compact stars/pulsars? This is a question historically judged exactly 90 years ago by Lev Landau for the first time, and is also focused to be the first big problem to be solved in this era of multi-messenger astronomy, including the gravitational-waves. Nucleons were supposed to be elementary particles in Landau’s time, but actually quarks are instead in the...
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Aldo Batta (INAOE)08/09/2022, 14:30Talk (in-person)
Since the first detection of gravitational waves on September 14 2015, there have been over 90 different GW events detected by LIGO. One of the formation scenarios for such compact binaries involve the evolution of isolated stellar binaries, which undergo multiple mass transfer episodes that ultimately lead to the formation of a tight binary composed of two compact objects such as neutron...
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Tomás Capistrán (IA-UNAM)08/09/2022, 14:50Talk (in-person)
One of the main challenges of the HAWC Observatory is to separate showers produced by gamma-rays from those produced by charged particles that represent almost 99.9% of the total particles arriving on Earth. HAWC applies a technique to distinguish them and to remove the most hadron-induced showers considered in the analysis. In this work, some techniques that have been applied to the HAWC data...
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Mabel Osorio (IA-UNAM)08/09/2022, 15:10Talk (in-person)
The spectral energy distribution (SED) of blazars is described by two radiative components, which are commonly modeled within the standard one-zone synchrotron self-Compton (SSC) leptonic framework. In this model, it is expected a strong correlation between energy band fluxes of the SED components, such as between soft X-ray and TeV gamma-ray fluxes. The correlations previously reported for...
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Dániel Barta (Wigner RCP)08/09/2022, 15:30Talk (in-person)
In recent years we have collected essential information on the integral parameters of neutron stars from multi-messenger observations of binary neutron-star mergers. In the light of these observations, we investigate the effects of rapid rotation on the structure and observable parameters of rapidly rotating relativistic compact stellar models based on the angular velocity and on the equations...
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Yunior Frainen Pérez Araujo (IA-UNAM)08/09/2022, 15:50Talk (in-person)
Detecting gravitational waves (GWs) associated with Gamma-ray bursts (GRBs) has reaffirmed their importance and interest. In particular, short GRBs have been associated as the electromagnetic counterpart of GWs, the first being the burst GRB 170817A associated with the event GW170817. Due to its large field of view and duty cycle and its many improvements in the reconstruction of events, HAWC...
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Delaney Farrell08/09/2022, 16:10Talk (virtual)
Neutron stars provide a unique laboratory for studying matter at extreme pressures and densities. While there is no direct way to explore their interior structure, X-rays emitted from these stars can indirectly provide clues to the equation of state (EOS) of the nuclear matter within through the inference the star’s mass and radius. However, inference of EOS directly from a star’s X-ray...
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Dorota Rosinska09/09/2022, 10:00Talk (in-person)
I will review the Ligo-Virgo-Kagra breakthrough discoveries and discuss their importance for astronomy, fundamental physics and cosmology.
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Peter Otto Hess (Instituto de Ciencias Nucleares, Universidad Nacional Autonoma de Mexico)09/09/2022, 10:30Talk (in-person)
The effects of a minimal length, on the structure near the event horizon of a Schwarzschild black hole, are investigated within the pseudo-complex General (pcGR) Relativity. It is shown that for small mass black holes there are strong effects, e.g., avoiding the accumulation of mass which might be important in the formation of black holes during the Big Bang. The pcGR adds to the metric a...
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Valeriy Dvoeglazov09/09/2022, 11:20Talk (virtual)
We compare various formalisms for neutral particles. It is found that they contain unexplained contradictions. Next, we investigate the spin-1/2 and spin-1 cases in different bases. Next, we look for relations with the Majorana-like field operator. We show explicitly incompatibility of the Majorana anzatzen with the Dirac-like field operators in both the original Majorana theory and its...
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Veronica Dexheimer09/09/2022, 11:40Talk (virtual)
Due to the present large uncertainty in the composition and interactions of dense nuclear matter, there are many different equation of state (EoS) models that can fulfill nuclear and astrophysical constraints. EoS repositories allow for a fast exchange of EoS between providers and simulation users, accelerating our understanding of dense matter. I discuss different EoS repositories, focusing...
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Irina Radinschi (Department of Physics, Gheorghe Asachi Technical University, Iasi)09/09/2022, 12:00Talk (virtual)
The problem of energy-momentum localization for a four-dimensional, spherically symmetric, electrically as well as magnetically charged black hole solution in a $f(R)$-type modified gravity with $(R)=R+2\beta \sqrt{R-8\Lambda}$ is studied. Asymptotically this solution behaves as an AdS or dS space-time, while it transforms to the Reissner-Nordstr\"{o}m solution in the case of zero magnetic...
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Luis Ureña-López09/09/2022, 12:20Talk (virtual)
Ultra-light axions are promising dark matter candidates, but the computation of their cosmological observables is challenging because of the rapid oscillations of the axion field around the minimum of its potential. Different approaches have been discussed in the literature to avoid such difficulty, mainly by using approximated formulas for the axion equation of state and sound speed. Here, we...
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Iván Margarito Álvarez Rios (Universidad Michoacana de San Nicolás de Hidalgo)Poster (virtual)
We present a code that simultaneously solves the Schrödinger-Poisson (SP) system together with the Euler equations. We have developed a tool that allows the study interation between the scalar dark matter described by the SP system weakly coupled to the luminous matter modeled by the Euler equations through the Poisson equation using periodic boundary conditions in each of the system...
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Biao-Peng Li (Xinjiang Astronomical Observatory/Key Laboratory of Radio Astronomy/University of Chinese Academy of Sciences)Poster (virtual)
The inclination angle of magnetic to rotation axisis (the inclination angle) of pulsars is an important parameter in pulsar physics. The changes in the inclination angle of a pulsar would lead to observable effects, such as changes in the pulse beam width and braking index of the star. On the one hand, a change in the charge density and/or a change in the current density in a pulsar's...
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Yashpal BhullaPoster (virtual)
We present the detection of 3 thermonuclear type-1 X-ray bursts in the LMXB neutron star 4U 1702-429. The data with the AstroSat payload SXT and LAXPC instruments. It is characterized by the bursts having a sharp rise and slow decay, representing the burning of H/He mixed fuel. We perform the time-resolved spectroscopy of bursts. We used three different techniques to analyze the bursts...
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Gretel QuinteroPoster (virtual)
Charged scalar bosons may naturally form in the interior of neutron stars due to the pairing of protons with antiparallel spins. Although the concentration of proton pairs is small with respect to that of neutrons or neutron pairs, they might still have a relevant role in the macrophysics of these compact objects, especially in connection to their response to the strong magnetic fields of...
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Dr Surajit Chattopadhyay (Department of Mathematics, Amity University, Kolkata)Poster (virtual)
In the present study, we have considered a scale factor corresponding to the bouncing universe. For this scale factor, we have demonstrated the reconstructed f(T) gravity in presence of bulk viscosity. The bulk viscosity coefficient has been chosen as a function of the Hubble parameter. In presence of this bulk viscous pressure, we have checked how the equation of state parameter is behaving...
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Dr Surajit Chattopadhyay (Department of Mathematics, Amity University, Kolkata)Poster (virtual)
This work investigates the cosmological application of interacting modified Chaplygin gas in the f(T) gravity framework, where T is the torsion scalar. The interacting MCG has been found to have the equation of state (EoS) parameter behaving like quintessence. However, the f(T) gravity reconstructed via the interacting MCG has been found to have EoS crossing the phantom boundary of -1. Thus,...
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Joshua T. Majekodunmi (Institute of Engineering Mathematics, Faculty of Applied and Human Sciences, Universiti Malaysia Perlis, Arau, 02600, Perlis, Malaysia)Poster (virtual)
Most neutron-deficient α-emitters are known to be of great relevance to the astrophysical rapid neutron-capture process (r-process) in superheavy nuclei [1, 2]. Thus, in this work, the decay properties of the newly observed 249No isotope from the α-decay of 253Rf [3] is theoretically investigated within the relativistic mean-field (RMF) framework [4,5] using the NL3* parameter set [6]. The...
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Vishal Parmar (School of Physics and Materials Science, Thapar Institute of Engineering and Technology)Poster (virtual)
The crystalline nature of neutron star crust is responsible for various fascinating observational effects such as the crustal moment of inertia, rotational frequency, quasi-periodic oscillations (QPOs) in soft gamma repeaters (SGRs), cooling etc [1, 2]. Most of the observed neutron stars possess a magnetic field of the order of $10^{15}$ G at the surface and much stronger in the solid crust...
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Mr Lucas Marcelo de Sá Marques dos Santos (IAG-USP)Poster (virtual)
Binary population synthesis (BPS) provides a direct way of studying the effects of different choices of binary evolution models and initial parameter distributions on present-day binary compact merger (BCM) populations, which can then be compared to empirical properties such as observed merger rates. Samples of zero-age main sequence (ZAMS) binaries to be evolved by BPS codes are typically...
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Fábio Köpp (UFRGS)Poster (virtual)
Surface temperatures of neutron star have been used as a probe for weakly interacting dark matter (WIMPs) models. While this is masked by a variety of heat sources at young age, in later stages of neutron stars the capture of dark matter by the star, after thermalization, renders a steady state and becames equal to photon emission. In this way, the heat generate by dark matter can rise the...
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Antonio Bernardo (IAG University of São Paulo)Poster (virtual)
This presentation will introduce a maximum entropy model for the fragmentation and hadronization of strange quark matter (SQM) ejected in the event of strange star mergers.
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The present formalism is capable of not only distinguishing the probabilities of mass spectra yielded by the fragmentation but also characterize the hadron zoo produced at the ejecta of strange star mergers and therefore a... -
Lismary de la Caridad Suárez González (Instituto de Cibernética Matemática y Física,Habana, Cuba)Poster (virtual)
We study the role of temperature on the macroscopic properties of magnetized Bose-Einstein condensate stars. These compact objects are composed of a gas of interacting neutral vector bosons coupled to a uniform and constant magnetic field. We assume that the boson-boson interactions are independent of the temperature and the magnetic field, and modeled them as tow-body contact interactions,...
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Sergey BorisovPoster (virtual)
OJ 287 is one of the most studied BL Lac objects with very long optical measurements which spectrum has been well measured through radio to X-ray band. The most outstanding characteristic of OJ 287 is its 12-year period, which is discovered in the optical range and has also been confirmed in the X-ray band. OJ 287 is supposed to be a binary black hole system in which a...
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Vera Georgievna SinitsynaPoster (virtual)
The overall observations of plerions from radio to the very high energy gamma-rays could provide information about the evolution of PWN from the young Crab-like stage to the older plerion stages. Geminga is a nearby (250 pc) and middle-aged pulsar of $~3.4\times10^5$ years. The Geminga pulsar wind nebula was detected in X-rays, and the detailed studies reveal the morphological and spectral...
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Hui Wang (Department of Physics and Electronic Engineering, Yuncheng University/Xinjiang Laboratory of Phase Transitions and Microstructures in Condensed Matters/Laboratory of Micro-Nano Electro Biosensors and Bionic Devices)Poster (virtual)
White dwarf(WD) are compact stars with electron degenrate pressure resisting against gravitational collapse. Using Zeeman splitting of optical spectra, polarization measurements, or optical rotation spectrophotometry, the magnetic field(MF) strengths of WDs can be observed directly. At present, the observed magnetic field intensity at the surface of a strongly magnetized WD is about...
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Zhi-Fu Gao (Xinjiang Astronomical Observatory/Key Laboratory of Radio Astronomy, Chinese Academy of Sciences)Poster (virtual)
Assuming that the timescale of the magnetic field decay is approximately equal to that of the stellar cooling via neutrino emission, we calculate the effective soft X-ray luminosity emitted from the surface of a magnetar. The three heating mechanisms of the magnetic-plastic flow, the magnetic domain and Ohmic decay powered by toroidal magnetic fields inside a magnetars's crust are...
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Adriel RodriguezPoster (virtual)
Compact stars possess the highest observed surface magnetic fields, and they are supposed to reach even bigger values at their centres. The magnetic field influences the mass, stability, size, and shape (magnetized stars are spheroidal) of compact objects. In the latest years, several theoretical models have been developed to analyse their role in the physics of these objects, sometimes...
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Prof. Elisama Eraldene Marques Lima (Instituto Federal da Bahia)Poster (virtual)
In this work, we investigate novel kinklike structures in a scalar field theory driven by Dirac-Born-Infeld (DBI) dynamics. Analytical features are reached through a first-order formalism and a deformation procedure. The description analyzed ensures the linear stability of the solutions found, and the deformation method permits to detect new topological solutions, given some systems of known...
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Ms Shilpa Rana (School of Physics and Materials Science, Thapar Institute of Engineering and Technology, Patiala 147004, India)Poster (virtual)
The low-energy heavy ion fusion reactions play a crucial role in elucidating various aspects of nuclear physics as well as astrophysics. The dynamics of these heavy-ion fusion reactions depend upon the internal structure properties such as the deformations of the interacting target and projectile nuclei [1]. This study aims to explore the influence of nuclear shape degrees of freedom on the...
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Prof. Abdel Nasser Tawfik (ENHEP Egyptian Network of High Energy Physics (EG))Poster (virtual)
When the minimal length approach emerging from the gravitational consequences on the fundamental theory of quantum mechanics, the generalization of the noncommutative Heisenberg algebra, is applied on quantum mechanics, possible gravitization of quantum mechanics and quantization of metric tensor could be suggested. The resulting spacelike second-derivative of coordinate on relativistic...
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Rim Mirzafatikhov, Prof. Vera G. Sinitsyna (P.N. Lebedev Physical Institute)Poster (virtual)
Cygnus Region contains many objects that are bright in all wavelengths, including one of the most powerful active star formation regions: Cyg OB2, pulsars, and supernova remnants. Some of the sources have been detected at high and very high energies. One of them was discovered due to the proximity to the well-known microquasar Cyg X-3 is TeV J2032+4130 object. This object is still of...
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JAIKHOMBA SINGHAPoster (virtual)
Pulsars are rotating neutron stars emitting a beam of radio light from the magnetic axis. They are known to have extreme stable periods. However, two types of rotational irregularities are seen in pulsars: glitches and timing noise. Glitches are the sudden jumps in the rotational frequency whereas timing noise is the slow wander of the rotational period of the pulsar. Both of these phenomena...
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Mr Marco A. A. de Paula (Universidade Federal do Pará)Poster (virtual)
We investigate the scattering properties of a massless scalar field in the background of a charged Ayón-Beato-García regular black hole solution. Using a numerical approach, we compute the differential scattering cross section for arbitrary values of the scattering angle and of the incident wave frequency. We compare our results with those obtained via the classical geodesic scattering of...
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Jun Tan (School of Mathematics and Information Technology, Yuncheng University/Xinjiang Laboratory of Phase Transitions and Microstructures in Condensed Matters/Laboratory of Micro-Nano Electro Biosensors and Bionic Devices)Poster (virtual)
Based on our previous work of Fu et al.\,(2020), we derive the rest seven scattering-state ($\chi^{(0)}, \phi^{(1)}, \chi^{(1)}, \phi^{(2)}$, $\chi^{(2)},\phi^{(3)}$ and $\chi^{(3)}$) solutions to the Dirac equation when $E=-im \pm ik \approx -im$, and establish a relation between differential scattering cross-section, $\sigma_{i*} (p,\theta,\varphi)$, and stellar matter density, $\mu$, using...
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Vera Yurievna SinitsinaPoster (virtual)
The investigation of supernova remnants at very high energy gamma-rays touches on the problem of the cosmic ray origin and, accordingly, the role of the Galaxy in their generation. As the presence of the electron cosmic-ray component is clearly seen by the emission generated by it in an SNR in a wide wavelength range, from radio to high-energy gamma-rays, while the nuclear...
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Ms Flor de María Lozano Rodríguez (Universidad de Guanajuato)Poster (virtual)
In this work, the structure formation for different modified gravity models will be described: Brans Dicke, $f(R)$, DGP, Symmetron. Such description is made through cosmological simulations carried out with the MG-PICOLA code that follows the COmoving Lagrangian Acceleration method. From them, the mass power spectrum is obtained, which we will compare with the resulting ones for the...
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Rahima Mokeddem (ppgcosmo)Poster (virtual)
In this work we extend the remapping method proposed by Mead and Peacock (MNRAS 440, 1233–1247 (2014)). This method allow us to remmap N-body simulations catalogues from one cosmology into another different cosmology directly without necessity of running an N-body simulations for each cosmology. On the other hand, it is well known that 21 cm mocks are constructed from, for example, halo or...
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Nishu Jain (School of Physics and Materials Science, Thapar Institute of Engineering and Technology, Patiala-147004, Punjab, India)Poster (virtual)
Theoretical and experimental investigations of the $\alpha$-decay properties of superheavy nuclei are the key parameter for understanding the nuclear structure and reaction dynamics. A comprehensive analysis of the $\alpha$-decay half-lives underlying 55 superheavy nuclei with $100 \leq Z \leq 120$ is performed within the axially deformed relativistic mean-field (RMF) formalism using the...
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Theeb Y. T. Alsultan (Center for Theoretical and Computational Physics, Department of Physics, Faculty of Science, University of Malaya, Kuala Lumpur 50603, Malaysia)Poster (virtual)
The present work is a theoretical study on the $\alpha$-decay half-lives of the even-even $^{254,256}$Rf isotopic chains using six different semi-empirical formulae, namely, the Viola-Seaborg semi-empirical formula (VSS), Modified Brown formula (mB1), Semiempirical formula based on fission theory (SemF IS2), Royer Formula (R), Wang Formula (wang), and Modified YQZR formula (MYQZR)[1]. The...
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Ai-Jun Dong () School of Physics and Electronic Science, Guizhou Normal University/Guizhou Provincial Key Laboratory of Radio Astronomy and Data Processing)Poster (virtual)
It is very controversial whether the X-ray emission of strong radio black hole sources is from jet or acrretion disk. In this work, we collected a sample of radio loud and lower luminosity black hole sources (e.g., active galaxy nuclei and X-ray binaries) to explore their radio--X-ray correlation and fundamental plane of black hole actities. We consider the beaming effect on the radio emission...
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Zheng Li (Xinjiang Astronomical Observatory/Key Laboratory of Radio Astronomy/University of Chinese Academy of Sciences)Poster (virtual)
With the increase of pulsar observation data, it is found that the relationship between the spin period $P$ and its derivative $P_{dot}$ of a long-period pulsar in the $P-P_{dot}$ diagram cannot be described by the standard magnetic dipole radiation (MDR) model. Recently, in order to explain pulsars' high-speed proper motions, we have proposed a Reutrino Rocket Jet Model (Li et al....
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Gabriel Neves Ferrari (Instituto Federal de Santa Catarina (IFSC))Poster (virtual)
A variational resummation technique incorporating renormalization group properties has been proposed as an alternative to solve the scale dependence problem which plagues the evaluation of thermodynamical quantities within the framework of approximations such as HTLpt (Hard Thermal-Loop Perturbation Theory). Here, this new method is used to evaluate the pressure of an interesting theory that...
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Samantha López (Institute of Cybernetics, Mathematics and Physics)Poster (virtual)
We study the effects of magnetic fields in the gravitational wave signals. Two main scenarios are explored, the first is the gravitational waves emitted from isolated neutron stars due to the deformation caused by the strong magnetic field, the second one is the effects of the magnetic field in the gravitational wave signal of a binary system. This work is a preliminary step towards that...
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