-
Arash MajidianPoster
In this study, we investigate the differential flux of cosmic rays. Initially, we demonstrate the applicability of Liouville's theorem to cosmic rays, establishing the conservation of intensity in phase space. In the following using the liquid drop model from nuclear physics, we derive the relationship for the differential flux and determine the spectral index in terms of energy, following a...
Go to contribution page -
Prof. Thomas Boller (MPE Garching)Talk
- A first look at Narrow-Line Seyfert 1 Galaxies with eROSITA
We first present the spectral and timing analysis of Narrow-Line Seyfert 1 Galaxies (NLS1s) with eROSITA based on the SDSS DR12 catalog. The SDSS DR12 spectral analysis is based on a power-law model using XSPEC fit with a Principal Component Analysis (PCA) background model. The photon index distribution is asymmetric with a mean...
- A first look at Narrow-Line Seyfert 1 Galaxies with eROSITA
-
MILTON CRISTIAN MAMANI LEQQUE (National University of the Altiplano Puno)Poster
This work explores the effects of quantum matter on classical spacetime through the theory of semiclassical gravity. Renormalization in curved spaces using Hadamard states is employed to calculate the energy momentum tensor. Solutions in ultrastatic and globally hyperbolic spacetimes are presented, highlighting the complexity of fourth-order semiclassical equations and the conditions...
Go to contribution page -
Alfredo Herrera-AguilarTalk
We extract the Hubble law by the frequency shift considerations of test particles revolving a Kerr black hole in asymptotically de Sitter spacetime. To this end, we consider massive geodesic particles circularly orbiting a Kerr-de Sitter black hole that emit redshifted photons towards a distant observer which is moving away from the emitter–black hole system. We further obtain an expression...
Go to contribution page -
Isadora Barbosa (UTFPR)Poster
This work introduces the exploration of sidereal coordinates in the context of LIV, opening doors to new possibilities, including sensitivity studies and simulations.
Go to contribution page
Our research resulted in creating a comprehensive repository of LIV parameters, which stands as a valuable resource for future research. -
Igor Kulikov (Institute of Computational Mathematics and Mathematical Geophysics SB RAS)Talk
The Relativistic jets are main sources of radio emission in the Universe. Multiscale flows in jets require of using to adaptive mesh technique. In talk will propose original the Patch-Block-Structured Adaptive-Mesh-Refinement technique for multi-scale modeling of relativistic jets. To use this technique, the numerical method was redesigned in a special way by means Coarray Fortran technology....
Go to contribution page -
Prof. João Rafael Santos (UFCG and BINGO Telescope)Talk
The Universe is currently in a phase of accelerated expansion, a fact that was experimentally proven in the late 1990s. Cosmological models involving scalar fields allow the description of this accelerated expansion regime in the Cosmos and present themselves as a promising alternative in the study of the inflationary eras, especially the actual one which is driven by the dark energy. In this...
Go to contribution page -
JOAO Santos (UFCG and BINGO Telescope)Talk
The Universe is currently in a phase of accelerated expansion, a fact that was experimentally proven in the late 1990s. Cosmological models involving scalar fields allow the description of this accelerated expansion regime in the Cosmos and present themselves as a promising alternative in the study of the inflationary eras, specially the actual one which is driven by the dark energy. In this...
Go to contribution page -
Anderson FauthTalk
The Cherenkov effect is widely employed in experiments involving cosmic rays and neutrinos that utilize large sensitive volumes. The water is widely employed as the sensitive medium, with the primary particle to be detected being the muon. In this work, we present the development of a new water-Cherenkov detector that utilizes a photon trapping system and silicon photomultipliers (SiPMs) to...
Go to contribution page -
Dr Carlos Solano (UNMSM & UNI, Peru)Poster
In High Energy Physics it is essential the study of the particles that make up everything (at least the known baryonic universe). Carrying out a study of these particles is necessary devices (detectors). These devices interact with particles through known physical processes and then, through a data acquisition system, one can proceed for further analysis. In the MINER𝜈A experiment, the cross-...
Go to contribution page -
Michael Santos (Instituto Tecnológico de Aeronáutica)Talk
The recent NICER observational data for the pulsars PSR J0030+0451 [[1]][1] and PSR J$0740+6620$ [[2]][2] impose new constrains in the mass-radius diagram of the corresponding compact star. Here, we investigate the possibility of such astrophysical object being a quark star. In particular, the quark matter is described by a holographic model with $N_c$ D3 branes and $N_f$ D7 probe branes,...
Go to contribution page -
Prof. Gregory VereshchaginTalk
We revisit the mechanism of pair creation in the electrosphere of compact astrophysical objects proposed by Vladimir Usov. Two previously ignored effects: the evaporation of electrons and acceleration of electrons and positrons are discovered. The rate of pair creation strongly depends on electric field strength in the electrosphere. We find that the luminosity in pairs may be as high as 10^52 erg/s.
Go to contribution page -
Mr Johor David Peñalba Quispitupa (Universidad Nacional de Ingeniería)Poster
The evolution of the scalar fluctuations via the Wigner formalism shows that the Wigner function is "squeezed". This result leads us to interpret the inflationary dynamics within the framework of open quantum systems, using the Lindblad master equation to model the interaction of quantum perturbations with their environment. This approach provides a deep understanding of the transition from...
Go to contribution page -
Dr Eri Atahualpa Mena Barboza (Universidad de Guadalajara)Poster
Modify gravity theories have received huge attention in the last decade. In this work, we find the Wheeler-DeWitt (WDW) equation in the Quantum Cosmology (QC) scenario for a Friedmann-Lemaitre-Robertson-Walker (FLRW) model using the deformed phase space in f(R) gravity.
Go to contribution page -
José Halim Montes de Oca Yemha (FESC-UNAM)Poster
In this study, we investigate Weakly Interacting Massive Particles as candidates for dark matter within an extended Standard Model framework that incorporates both scalar and fermion fields. We calculate the relic density and spin-independent scattering cross-section for these dark matter candidates and compare our results with the values reported by the PLANCK and XENON collaborations. Our...
Go to contribution page -
Prof. Vera G. Sinitsyna (P.N. Lebedev Physical Institute, Russian Academy of Science), Vera Y. Sinitsyna (P.N. Lebedev Physical Institute, Russian Academy of Science)Poster
G166.0+4.3 (VRO 42.05.01) is a mixed-morphology supernova remnant having a different spatial distribution of emission viewed in radio and X-rays. A sharp edge-brightened circular shape of the shell and wing component is visible in radio wavelength. Whereas X-ray emission is dominated by a bright spot in the wing, without any edge-brightened structures. Observed shape of this SNR looking like a...
Go to contribution page -
Dr Benjamin Wehmeyer (University of Wroclaw)Talk
Studying the galactic chemical evolution with short lived radioisotopes (SLRs) has a significant advantage over using stable elements: Due to their radioactive decay, SLRs carry additional timing information on astrophysical nucleosynthesis sites.
We can use meteoritic abundance data in conjunction with a chemical evolution model to constrain the physical conditions in the last rapid...
Go to contribution page -
Dr Wei-Liang Qian (University of Sao Paulo)Talk
Damour-Solodukhin wormholes are intriguing theoretical constructs that closely mimic many properties of black holes. This study examines two specific aspects of the waveforms emitted from these wormholes: the late-time tails and echoes, which are pivotal in distinguishing them from black holes. Both features manifest in the later stages of quasinormal oscillations and originate from...
Go to contribution page -
Vivek Baruah Thapa (Bhawanipur Anchalik College)Talk
A diverse array of equations of state (EoSs), formulated within the covariant density functional theory of hadronic matter and incorporating density-dependent couplings, is leveraged to scrutinize polar f- and p-oscillations in both cold and hot compact stars. We delve into the correlations between oscillation frequencies of cold purely nucleonic neutron stars (NSs), their global parameters,...
Go to contribution page -
STEFANO RAFAEL GONZALES GUERREROPoster
Given the previous work "Classicalization of the initial conditions in the inflationary universe", where the matter present in the universe was modeled by means of a scalar field known as inflaton, the transition of quantum fluctuations (within the context of inflation, it is known that temperature and polarization inhomogeneities of the CMB are driven by scalar and tensor fluctuations) to...
Go to contribution page -
Prof. Steven Gullberg (University of Oklahoma)Talk
Machu Piqchu has been variously described as a citadel, a lost city, a royal estate, and a sacred center. Machu Piqchu was likely recognized by the Inkas as a place of power because of its many granite outcrops and caves and the cardinality of mountains such as Veronica, Machu Piqchu, Wayna Piqchu, Pumasillo, and the snow peak of Salcantay. Machu Piqchu is a multi-faceted complex that exhibits...
Go to contribution page -
Prof. Steven Gullberg (University of Oklahoma)Talk
The Inkas worshipped the Sun, and their emperor was thought to be the son of the Sun. They conquered most of the Andes and their former empire is replete with examples of their astronomy. They used solar positions on the horizon for calendrical purposes and managed their crops and religious festivals in this manner. Many examples remain of their intentional light and shadow effects that...
Go to contribution page -
Dr Messias de Brito Cruz (Universidade Estadual da Paraíba - UEPB)Poster
Este estudo investiga perturbações e aspectos-chave de um modelo de buraco negro com correções quânticas dentro do framework da Gravidade Quântica em Loop. Calculamos os modos quasi-normais, revelando uma dependência significativa dos parâmetros da Gravidade Quântica em Loop. Ao mesmo tempo, avaliamos a estabilidade do buraco negro quântico. Nossos resultados sugerem possibilidades...
Go to contribution page -
Prof. Vera G. Sinitsyna, (P.N. Lebedev Physical Institute, Russian Academy of Science), Prof. Vera Y. Sinitsyna (P.N. Lebedev Physical Institute, Russian Academy of Science)Poster
Mkn 180 is the BL Lac object with spectrum has been measured through radio and X-ray band to high energy gamma-rays. This object is considered as a potential candidate for the source of high-energy leptonic and\or hadronic cosmic-ray acceleration. Also, it has been proposed to be a GeV – TeV gamma-ray source. The very high energy gamma-rays from Mkn 180 were detected due to the trigger...
Go to contribution page -
Dr Fabio Köpp (UFSC)Poster
We describe in this work a stellar phase composed of up, down and strange quarks, based on the repulsive vector interaction enhanced MIT bag model (vMIT), a crucial component to describe stable and massive hybrid NS configurations with quark matter cores, in agreement with the recent observations of pulsars with two solar masses. The motivation for this study, based on known theoretical...
Go to contribution page -
Dr Fabio Köpp (UFSC)Poster
In the search for the true ground state of dense matter at sufficiently large densities and low temperatures, in the following we model the mass of color-flavor locked strange quark stars. We address then feasibility conditions for the realization of the phase diagram of dense nuclear matter, as a function of the baryonic chemical potential, $\mu_B$ , and the temperature $T$ (plane $\mu_B - T$...
Go to contribution page -
Dr Fabio Köpp (UFSC)Poster
In the present work we address the equation of state for strange quark stars considering a model of high-density perturbative QCD (PQCD). In the second order regime of the strong coupling constant, the results depend sensitively on the choice of the renormalization mass scale that corresponds in turn to a first-order chiral transition. The results indicate quark stars with maximum masses...
Go to contribution page -
Jose Francisco Bautista Leon (UNI)Poster
The latest results from proton-proton collisions, reported from experiments at CERN, have provided evidence of collective phenomena similar to those observed in relativistic heavy ion collisions. The enhancement of strangeness as a function of multiplicity in proton-proton collisions is considered a crucial result, as it supports the potential creation of mini Quark-Gluon Plasma. In the...
Go to contribution page -
Prof. Vera G. Sinitsyna (P.N. Lebedev Physical Institute, Russian Academy of Science)Talk
Active galactic nucleus (AGN) phenomenon and a role of jets, powered by central black hole of AGN, in the feedback of the surroundings on the different scales is the matter of the detailed multiwavelength investigations. The long-term observations of AGNi are used to reveal the processes taking place in the very proximity to the supermassive black holes. One of the approaches to such studies...
Go to contribution page -
Dr ERI ATAHUALPA MENA BARBOZA (Centro Universitario de la CIénega, Universidad de Guadalajara)Talk
we develop and apply the WKB-type approximation to several examples
Go to contribution page
of noncommutative quantum cosmology, obtaining the time evolution of the noncommutative universe. This is accomplished by starting from a noncommutative quantum formulation of cosmology, where the noncommutativity is introduced by a deformation on the minisuperspace variables. This procedure gives a straightforward algorithm... -
Adriana Valio (Center for Radio Astronomy and Astrophysics Mackenzie)Talk
For a deeper understanding of the physical processes at play in solar
Go to contribution page
flares, it is necessary to analyse the flare emissions at multiple wavelengths. This multi-frequency approach enables the characterisation of energetic electrons accelerated from tens of keV and up to several hundreds of MeV. This study reports on the observation of nine solar flares, in which the spectral parameters were... -
Dr Hong Guo (University of Sao Paulo)Talk
Holographic superconductor phase transition and spontaneous scalarization are triggered by the instability of the underlying vacuum black hole spacetime. Although both hairy black hole solutions are closely associated with the tachyonic instability of the scalar degree of freedom, they are understood to be driven by distinct causes. It is, therefore, interesting to explore the interplay...
Go to contribution page -
Dr Tonatiuh Matos (Cinvestav)Talk
It is a fact that the universe lives on a Gravitational Wave Background (GWB), which may be in the form of extra energy, which is not contained in Einstein's field equations. In previous work, a new model called Compton Mass Dark Energy (CMaDE) was developed to explain the current accelerated expansion of the universe where a GWB was incorporated by extending Einstein's equations...
Go to contribution page -
Ravi Sheth (University of Pennsylvania)Talk
I will describe recent work showing how to estimate the abundance of black holes which formed over an extended period of time, with a wide spectrum of masses, during radiation domination.
Go to contribution page -
Supragyan PriyadarshineeTalk
We explore the dynamics of the massless scalar field in the context of hairy black holes within the Einstein–Maxwell-scalar gravity system. Utilizing both the series solution and shooting methods, we numerically compute the corresponding quasinormal modes (QNMs) across various black hole parameters. Notably, the values obtained from these two methods exhibit robust agreement. The consistently...
Go to contribution page -
Diego Fiorentini (Universidad Privada del Norte)Poster
In this work, we propose a generalization of the improved gauge unfixing formalism in order to generate gauge symmetries in the non-Abelian valued systems. This generalization displays a proper and formal reformulation of second-class systems within the phase space itself. Then, we present our formalism in a manifestly gauge invariant resolution of the $SU(N)$ massive Yang-Mills and $SU(2)$...
Go to contribution page -
Adriana González-Juárez (Instituto de Física, Benemérita Universidad Autónoma de Puebla)Talk
We review a General Relativistic (GR) method to determine the black hole (BH) parameters: mass-to-distance ratio, position and recessional velocity of 16 active galactic nuclei (AGNs) of Seyfert type, which have an accretion disk with water masers circulating around the BH. This GR method makes use of astrophysical observations: the redshifted and the blueshifted photons emitted from the...
Go to contribution page -
Sergio MendozaTalk
This is an abstract
Go to contribution page -
Mr Angel Oswaldo Montes Palma (Universidad Nacional de Ingeniería)Poster
In this work, space-time will be studied taking into account a geometric structure of affine space, which can be identified with $\mathbb{R}^4$ space. The focus will be on the development of non-inertial reference systems, also called observers, and the description of the effects that can be physically measured by them. Therefore, in addition to discussing concepts such as world line, the...
Go to contribution page -
Silas Guida Vilhena (ITA)Poster
We investigate compact objects in modified teleparallel gravity with realistic equations of state. We propose a modification of Teleparallel Equivalent to General Relativity, then an appropriate tetrad is applied to the field equations. A specific set of relations showing an equivalency between our gravitational model and the New General Relativity is found. The conservation equation implies...
Go to contribution page -
Jorge HorvathTalk
The populations of many types of neutron stars and black holes in the galaxy is discussed, with emphasis in the latest mass determinations and new phenomena detected from some members of the former group. An attempt to relate these populations to the merging binary systems, studied with a new population synthesis tool BOSSA developed at USP- São Paulo described.
Go to contribution page -
Shuichi Yokoyama (Ritsumeikan University)Talk
As seen in most textbooks of astrophysics, most astronomical bodies such as main sequence stars have been investigated only by Newtonian gravity. This is presumably based on a belief that Newtonian physics could be sufficient to extract important physics of most astronomical bodies except compact stars, and that General Relativity would be too precise to be suitable.
In this talk, I will...
Go to contribution page -
MARIANO JESUS EFFIO CUEVA (National University of Engineering)Poster
Experimentally, the creation of Quark Gluon Plasma in relativistic heavy ion collisions is well known; its properties are being investigated in different experiments around the world at different energies. However, the results from proton-proton collisions are under debate since there are results with behavior like those observed in heavy ion collisions, for instance, collective phenomena,...
Go to contribution page -
MARIANO JESUS EFFIO CUEVA (UNI)Poster
Experimentally, the creation of Quark Gluon Plasma in relativistic heavy ion collisions is well known; its properties are being investigated in different experiments around the world at different energies. However, the results from proton-proton collisions are under debate since there are results with behavior like those observed in heavy ion collisions, for instance, collective phenomena,...
Go to contribution page -
Dr Benno Bodmann (UFRGS)Talk
Based on an analytically continued Riemannian foliated quantum gravity super-Hamiltonian, known as Branch Cut Quantum Gravity (BCQG) we propose a novel approach to investigating the effects of noncommutative geometry on a minisuperspace of variables, influencing the acceleration behavior of the universe's wave function and the cosmic scale factor. Noncommutativity is introduced through a...
Go to contribution page -
Roland AllenTalk
In this talk, three fundamental problems will be addressed within a unified picture [1-4]. The solution of the cosmological constant problem has two aspects: According to (10.3) of [1], spin 1/2 fermion fields and spin 0 boson fields give zero contribution to the conventional cosmological constant; and (10.8) of [1] (which is completely consistent with the Casimir effect) implies that the same...
Go to contribution page -
Arash MajidianPoster
Quantum mechanical particles will be affected by the gravitational field of black holes and the curvature of space. In general, by writing the structure of the desired Hilbert space near a black hole, the physical and quantum mechanical behavior of a fundamental particle can be investigated. For example, we will indicate the wave packet motion of a particle and its modified standard quantum...
Go to contribution page -
Prof. Peter O. Hess (UNAM)Talk
We first resume the main properties of the pseudo-complex General Relativity (pcGR). Then the Hawking temperature is determined within pcGR for a black hole, with varying the intensity of the dark energy around the central mass. In particular we investigate the effects of a minimal length, which is a consequence of pcGR. Three cases are studied: i) The pc-Schwarzschild case with zero minimal...
Go to contribution page -
Mrs Gabriel Zardo Becker (Federal University of Santa Catarina - UFSC)Talk
Recently, the FPF LHC neutrino detector recorded its first measurements, opening new possibilities for studying weak interactions. In this work, we explore related observable, such as the proton structure function ($F_2$) from weak interactions, and the cross section of $W^+W^- \rightarrow X$ and $\gamma W^- \rightarrow X$, which could be significant for future colliders. We employ QCD...
Go to contribution page -
Prof. Rodrigo F. Santos (UNIPLENA Educacional)Talk
We study the hypothesis of deformation of the Lorentz transformations by a universal minimum velocity and we seek to apply this hypothesis to superfluids. Relating the minimum velocity to the idea of a fluid, with superfluid properties, in previous works we related the minimum velocity to the cosmological constant and even to cosmic inflation. Soon we could generate a hypothetical superfluid...
Go to contribution page -
Sarahí Silva García (Universidad Nacional Autónoma de México)Talk
The Lagrangian of matter is a crucial component in the action of relativistic gravity theories with matter couplings, such as general relativity. Particularly in alternative gravity theories featuring non-minimal curvature-matter couplings, the matter Lagrangian explicitly figures in the field equations. Consequently, its precise value is necessary to fully compute these field equations. In...
Go to contribution page -
Pan-Pan WangTalk
The space-based gravitational wave detector will open a new window in the frequency range of 0.1 mHz to 1 Hz, which cannot be covered by ground-based gravitational wave detectors. This is of great significance for studying the formation and evolution of the universe. However, detecting gravitational wave signals in space is a significant challenge. One of the main obstacles is the high level...
Go to contribution page -
Prof. Vera G. Sinitsyna (P.N. Lebedev Physical Institute, Russian Academy of Science), Prof. Vera Y. Sinitsyna (P.N. Lebedev Physical Institute, Russian Academy of Science)Talk
4U2129+47 is classified as a Low-Mass X-ray Binary containing a neutron star. It is actively studied in the optical and X-ray. It was found that exhibit both outburst and quiescent states. The spectroscopic investigations of optical counterpart of neutron star in this binary system shown that the 4U 2129+47 is a hierarchical triple system. X-ray observations shown the evidence for a spatially...
Go to contribution page -
Prof. Eugene Oks (Auburn University, USA)Talk
The existence of the HI regions in dark matter halos of a number of galaxies is the observational fact. Each of the eight galaxies analyzed by observers had approximately the same maximum surface brightness temperature throughout its disc, what was explained by the self-absorption in the hydrogen line 21 cm. The opacity or absorption coefficient τν is controlled by the column density NH of...
Go to contribution page
Choose timezone
Your profile timezone: