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Tsvi Piran (The Hebrew University, Jerusalem, Israel)10/05/2015, 09:00STARS2015TalkBeyond being prime targets for gravitational radiation detection Compact Binary Mergers are the likely sources of short GRBs as well as the most likely origin of heavy R-process material. The latter ideas, a 25 years old proposition, has received observational support with the discovery of a Macro-nova - an IR signal that followed the short GRB 130603B and is the hallmark of newly formed...Go to contribution page
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Thomas Boller (M)10/05/2015, 09:40STARS2015Talkmodified theory of gravitation, observational test, black hole imagingGo to contribution page
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Peter Hess10/05/2015, 10:40SMFNS2015TalkThe proposal consists of extending the 4-dimensional physical space to an 8-dimensional pseudo-complex (pc) space. The pc-extension introduces a minimal length as a parameter, thus, it is unaffected by Poincaré transformations. All continuous symmetries are maintained. In the extended space, standard quantization rules are applied and it is shown that after projection to the 4-dimensional...Go to contribution page
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Roberto SUSSMAN (ICN-UNAM, Mexico)10/05/2015, 11:20STARS2015TalkWe provide specific examples of how a class of exact solutions of Einstein's equations (the Szekeres models) can be worked out to describe the evolution of a collection of over-densities and voids in assorted directions. The resulting structures can be used to study the full relativistic non-linear effects in the dynamics of structure formation and growth suppression, in gravitational lensing...Go to contribution page
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Eduardo Guendelman (Ben Gurion University)10/05/2015, 12:00STARS2015TalkA new class of gravity-matter models defined in terms of two independent non-Riemannian volume forms (alternative generally covariant integration measure densities) on the space-time manifold are studied in some detail. These models involve an additional R^2 (square of the scalar curvature) term as well as scalar matter field potentials of appropriate form so that the pertinent action...Go to contribution page
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Jürgen Struckmeier (GSI)10/05/2015, 14:00STARS2015TalkIt is widely accepted that the fundamental laws of nature should follow from an action principle. This holds in particular for the laws determining the dynamics of the space-time geometry. The general principle of relativity requires the action principle to be maintained in its form under the transition from one reference frame to another, possibly non-inertial frame of reference. The...Go to contribution page
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Kenneth Nordtvedt (Montana State University)10/05/2015, 14:40STARS2015TalkA local system of bodies in General Relativity whose exterior metric field asymptotically approaches the Minkowski metric effaces any effects of the matter distribution exterior to the Minkowski boundary condition. A local gravitational system also exhibits certain invariances under time dilation and spatial contractions upon boosts. For composite body sources, interior effacement is manifest...Go to contribution page
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Jorge Horvath (IAG-USP)10/05/2015, 15:20STARS2015TalkEvolution of entropy in stellar systemsGo to contribution page
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Gabriella Piccinelli (Centro Tecnológico, FES Aragón, UNAM, México)10/05/2015, 16:20SMFNS2015TalkMagnetic fields appear everywhere in the universe. Their widespread presence at high redshifts and very large scales suggests that their origin could be primordial. In particular, their presence during the inflationary epoch can certainly not be ruled out. In the warm inflation scenario, the coupling of the inflaton to other bosonic and fermionic fields gives rise to dissipative effects that...Go to contribution page
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Maciek Wielgus (Nicolaus Copernicus Astronomical Center, Polish Academy of Sciences)10/05/2015, 16:50STARS2015TalkI will present most recent results, not yet published, concerning the super-Eddington accretion onto neutron stars and black holes. In the case of neutron stars, a new phenomenon is predicted: a levitating atmosphere. In the case of black holes, the Polish Doughnut model for super critical accretion is critically revisited.Go to contribution page
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Thomas Curtright10/05/2015, 17:30STARS2015TalkI will discuss spherically symmetric solutions of hypothetical scalar field "galileon" models, first in flat space-time, and then in the context of general relativity. For the latter, using numerical methods, I find both censored and naked solutions arising from physically reasonable boundary conditions. Both types of solutions are of comparable non-zero measure in terms of the initial...Go to contribution page
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Andres Escala (Universidad de Chile)10/05/2015, 18:00STARS2015TalkBlack Hole Astrophysics - Gravitational Radiation - Galactic MergersGo to contribution page
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Cristina Biino (INFN Torino (IT))11/05/2015, 09:00STARS2015TalkThe talk will report on selected Standard Model (SM) physics highlights obtained by the ATLAS and CMS experiments in the first 3 years of data taking at the new Large Hadron Collider in Geneva. By far the most important and exciting result of LHC Run1 has been the observation of a new boson with a mass of 125 GeV, consistent with the properties of the SM Higgs boson. The discovery of the...Go to contribution page
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Geraldine Conti (CERN)11/05/2015, 09:40STARS2015TalkThe Large Hadron Collider (LHC) at CERN has allowed the ATLAS and CMS experiments to collect a large amount of proton-proton collision data at 7 TeV and 8 TeV centre-of-mass energies. This dataset was used to discover a Standard Model (SM) Higgs-like boson at a mass of about 125 GeV. Beside this, an impressive number of searches for deviations from the SM expectations have been carried out in...Go to contribution page
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Katharina Mueller (Universitaet Zuerich (CH))11/05/2015, 10:40STARS2015TalkThe production of J/ψ and Υ-mesons decaying into dimuon final state is studied at the LHCb experiment, with rapidity 1.5 < y < 4.0 or -5.0 < y < -2.5 and transverse momentum pT < 15 GeV/c, in proton-lead collisions at a proton-nucleon centre-of-mass energy of 5 TeV. The analysis is based on a data sample corresponding to an integrated luminosity of 1.6/nb. The forward-backward production ratio...Go to contribution page
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Horst Stoecker (Frankfurt Institute for Advanced Studies - FIAS and Institut fuer Theoretische Physik - ITP, Frankfurt am Main, Germany)11/05/2015, 11:20STARS2015TalkUpcoming experiments at GSI, FAiR, BNL and CERN are discussed. Special emphasis is given to the discovery potential for exotic Phases of Dense Matter. The role of the accelerator experiments for understanding Neutron Star NS and Supernova SN dynamics is critically reviewed.Go to contribution page
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Ulisses Barres de Almeida (Centro Brasileiro de Pesquisas Físicas)11/05/2015, 12:00STARS2015TalkGamma-ray astronomy holds a great potential for Astrophysics, Particle Physics and Cosmology. The CTA is an international initiative to build the next generation of ground- based gamma-ray observatories, which will represent a factor of 5-10x improvement in the sensitivity of observations in the range 100 GeV - 10 TeV, as well as an extension of the observational capabilities down to energies...Go to contribution page
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Martin Roth11/05/2015, 14:00STARS2015TalkThe European Extremely Large Telescope (E-ELT) is the current 1st priority flagship project of European ground-based Astronomy in the optical and NIR. After completion in 2024, the E-ELT will be the most advanced and most sensitive facility for diffraction limited imaging and spectroscopy with a giant aperture for the next decades to come. MOSAIC is a conceptual idea to exploit this...Go to contribution page
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Hans Zinnecker (Univ. Stuttgart)11/05/2015, 14:40STARS2015TalkSOFIA, the Stratospheric Observatory for Infrared Astronomy, is a Boeing 747SP, equipped with a 2.7m telescope that flies at an altitude of 12-14 km (above the tropopause) to observe the far-infrared radiation from space which does not reach ground-based observatories due to absorption by water vapor. One of the SOFIA instruments is HAWC-pol, a far-infrared camera with 5 filters (50-200...Go to contribution page
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Carola Dobrigkeit (UNICAMP, Brazil)11/05/2015, 15:20STARS2015TalkThe Pierre Auger Observatory addresses the most fundamental questions about the nature and origin of the highest-energy cosmic rays. The data taken with the Pierre Auger Observatory have already led to a number of major breakthroughs in the field contributing to the advance of our understanding of these extremely energetic particles. The spectrum and the arrival direction distribution are key...Go to contribution page
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Laura Molina Bueno (Universidad de Granada)11/05/2015, 16:20STARS2015TalkThe Pierre Auger Observatory is the largest ultra-high energy cosmic ray experiment built so far. It is a hybrid detector, since it measures both the fluorescence light emitted while the air-showers develop in the atmosphere and the particles reaching the ground. We present the results related to the mass composition of ultra-high energy cosmic rays as obtained from both types of...Go to contribution page
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Massimo Della Valle (Osservatorio Astronomico di Capodimonte - Istituto Nazionale di Astrofisica - INAF, Napoli, Italy)11/05/2015, 16:50STARS2015TalkWe review the observational status of the Supernova/Gamma-Ray Burst connection. Most observations collected in the last 15 years show that long duration Gamma-ray Bursts are associated with broad lines SNe-LBC, although a few exceptions do exist. Current estimates of the SN and GRB rates yield a ratio GRB/SNe-LBC less (or much less) than 3%. We discuss the reasons for this small ratio.Go to contribution page
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Joerg Aichelin (Subatech/CNRS)12/05/2015, 09:00STARS2015TalkDuring a ultrarelativistic heavy ion collisions a plasma of quarks and gluons (QGP) may be created, a state of matter which may also be present in the center of neutron stars. The problem is to verify its existence because at the end only hadrons are present. We expose why heavy mesons may be a good tool to study the existence and the properties of the QGP and present the results we obtained...Go to contribution page
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Elena Bratkovskaya (FIAS)12/05/2015, 09:40STARS2015TalkWe discuss the properties of nuclear matter at different conditions: from "cold" at normal nuclear density to the very "hot" and compressed state of Quark-Gluon-Plazma. Those conditions are realized at relativistic proton-nucleus and heavy-ion collisions. As a "tool" for our study we use the Parton-Hadron-String Dynamics (PHSD) microscopic transport approach, which elaborates the partonic...Go to contribution page
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Marcus Bleicher (Uni Frankfurt & FIAS)12/05/2015, 10:40STARS2015TalkWe review current concepts and models used to describe the evolution of the hot and dense matter created in heavy ion collisions at LHC, RHIC and FAIR. To this aim, we will discuss recent extensions of transport models based on the Boltzmann equation to include a hydrodynamical stage that allows for a consistent treatment of all stages of the reaction, including a phase transition to a QGP....Go to contribution page
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Werner Becker (Max Planck fur Extraterrestrische Physik - MPE, Garching, Germany)12/05/2015, 11:20STARS2015TalkAn external reference system suitable for deep space navigation can be defined by fast spinning and strongly magnetized neutron stars. Their beamed periodic signals have timing stabilities comparable to atomic clocks and provide characteristic temporal signatures that can be used as natural navigation beacons, quite similar to the use of GPS satellites for navigation on Earth. By comparing...Go to contribution page
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German Lugones (UFABC)12/05/2015, 12:00STARS2015TalkAccording to braneworld models the observable universe could be restricted to a 1+3 surface (a “brane” where Standard Model particles and fields are trapped) embedded in a higher dimensional spacetime (the “bulk”) that can be accessed by gravity. In this work we investigate the properties of compact stars in the Randall-Sundrum II type braneworld. Adopting the well established BPS equation...Go to contribution page
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Rodrigo Negreiros (Universidade Federal Fluminense)12/05/2015, 14:00STARS2015TalkBraking index of Young Neutron Stars.Go to contribution page
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Sergei Popov (Moscow State University)12/05/2015, 14:40STARS2015TalkWe perform population synthesis of near-by (up to a few kpc) young (less than a few Myrs) neutron stars. We consider objects observable in soft X-rays due to their thermal surface emission. Observations demonstrate than about a dozen of young cooling neutron stars are observed int he solar vicinity. They represent two populations: radio pulsars and so-called "Magnificent Seven". We study...Go to contribution page
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Lino Miramonti (Physics Department of Milano University and Istituto Nazionale di Fisica Nucleare - INFN, Italy)12/05/2015, 15:20STARS2015TalkBorexino is an organic liquid scintillator detector located in the Gran Sasso National Laboratory in the central Italy. It has been designed for real-time spectroscopy of low energy solar neutrinos. In Phase I of the experiment lasting for three years, between May 2007 and May 2010, the Collaboration performed the first independent measurements of 7Be, 8B and pep solar neutrino fluxes. After a...Go to contribution page
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Zhaosheng Li (Peking University)12/05/2015, 16:20STARS2015TalkPhotospheric radius expansion (PRE) bursts have already been used to constrain the masses and radii of neutron stars. *RXTE* observed three PRE bursts in 4U 1746-37, all with low touchdown fluxes. We discuss here the possibility of low mass neutron star in 4U 1746-37 because the Eddington luminosity depends on stellar mass. With typical values of hydrogen mass fraction and color correction...Go to contribution page
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Alejandro Cabo Montes de Oca (ICIMAF)14/05/2015, 09:30SMFNS2015TalkThe magnetic field dependence of vacuum energy of the Weinberg-Salam model (WSM) is investigated. It follows that the W particles contribution makes the full potential positive for extremely large fields. This changes the situation with respect to QED. Thus, the asymptotic freedom of this theory helps to solve the undesirable negative values of the Heisenberg-Euler potential at large magnetic...Go to contribution page
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Hugo Pérez Rojas (Institute of Cybernetics, Mathematics and Physics)14/05/2015, 10:00STARS2015TalkFor critical and supercritical magnetic fields electrons and even photons behave as one dimensional particles, leading to vanishing transverse pressures. The outcome suggests a collapsing behavior orthogonal to the magnetic field, leading to long objects. We conjecture they may have a connection with jets in astrophysics.Go to contribution page
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Eduardo Guendelman (Ben Gurion University)14/05/2015, 11:00SMFNS2015TalkA Scalar QED analogy is possible for the photon axion system that allows to describe axion photon spitting in strong magnetic fields. Results from these analysis have been used recently to claim evidence for axion like particles from the sun. Also possible photon splitting effects could appear in pulsars, we will review this subjectGo to contribution page
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Jorge Luis Acosta Avalo (INSTEC)14/05/2015, 11:30SMFNS2015TalkWe demonstrate the existence of the chiral magnetic effect inan electron-positron magnetized gas. A pseudo-vector(conserved)Ohm current is induced by the electric field related to the longitudinal QED mode propagating parallel to the external magnetic field and separating opposite charges of the same heliticity. From a relation between axial and electromagnetic currents we obtain a...Go to contribution page
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Dr Aurora Pérez Martínez (ICIMAF), Lidice Cruz Rodríguez (Havana University)14/05/2015, 11:45STARS2015TalkThe dispersion equations for photons moving parallel to a constant magnetic field are solved for diluted magnetized gas. The quantum Faraday angle is obtained for a quantum relativistic diluted gas in the strong field limit as well as in the weak field approximation. Applications to the photon propagation in the magnetosphere of neutron stars are discussed.Go to contribution page
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Diana Alvear Terrero (Facultad de Física, Universidad de La Habana), Miguel Castillo García (Facultad de Física, Universidad de la Habana)14/05/2015, 12:00SMFNS2015TalkWe discuss the structure of Magnetized White Dwarfs by considering anisotropic equations of state (EoS) as well as the anisotropic equation of hydrostatic equilibrium. Specifically, we examine the weak and strong magnetic field limits. For weak magnetic field values ($B < B_c \sim 10^{13} G$) we obtain the EoS through an Euler-MacLaurin expansion of the thermodynamic potential. Whereas in...Go to contribution page
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Dario León (Facultad de Física, Universidad de La Habana)14/05/2015, 12:15STARS2015TalkWe include, in the observed correlation [1] between lifetime cancer risk and the accumulative number of steem cell divisions in a tissue, a new variable related to the effective radiation dose received by that tissue. Computed natural radiation dose is compared with data contained in the Report [2], whereas the artificial (man made) radiation dose is taken from [2]. [1] C. Tomasetti and B....Go to contribution page
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Augusto González (Instituto de Cibernética, Matemática y Física, La Habana)14/05/2015, 15:00STARS2015TalkWe suggest a possible correlation between the ionization events caused by the natural background radiation and the experimental data on mutations with damage in the DNA repair mechanism, coming from the Long Term Evolution Experiment in E. Coli populations.Go to contribution page
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Osmel Martin14/05/2015, 15:30STARS2015TalkHabitable planets, stellar explosions, the role of O2/O3 system, biological implicationsGo to contribution page
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Jorge Horvath (IAG-USP)14/05/2015, 16:00SMFNS2015TalkEvolution of magnetic fields in accreting neutron star systemsGo to contribution page
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Daryel Manreza Paret (Facultad de Fisica Universidad de la Habana)15/05/2015, 09:30SMFNS2015TalkThe problem of the maximum masses of magnetized White Dwarfs (WD) is revisited considering the impact of a strong magnetic field onto the structure equations. The magnetic field splits the pressure in parallel and perpendicular one. Firstly we will present stable solutions of TOV equations for the parallel pressures, and physical solutions vanish for the perpendicular pressure when $B >...Go to contribution page
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Gao Zhi Fu (Xinjiang Astronomical Observatory, Chinese Academy of Sciences), Wang Na (Xinjiang Astronomical Observatory, Chinese Academy of Sciences)15/05/2015, 10:00SMFNS2015TalkBased on our previous work, we deduce a general formula for pressure of degenerate and relativistic electrons, $P_{e}$, which is suitable for superhigh magnetic fields, discuss the quantization of Landau levels of electrons, and consider the quantum electrodynamic(QED) effects on the equations of states (EOSs) for different matter systems. The main conclusions are as follows: $P_{e}$ is...Go to contribution page
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Hao Tong (Xinjiang Astronomical Observatory, Chinese Academy of Sciences)15/05/2015, 11:00SMFNS2015TalkMagnetars are neutron stars powered by their superstrong magnetic field. The discovery of low magnetic field magnetars etc has deeped our understanding of magnetars. Accreting normal neutron stars are discovery 40 years ago. However, no strong evidence for the existence of accreting magnetars are found up to now. Recently, an ultraluminous X-ray source powered by an accreting neutron star...Go to contribution page
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Martin Roth15/05/2015, 11:30SMFNS2015TalkOver the last 10-15 years there has been a rapid development of the technique of integral field spectroscopy (IFS) in the optical and NIR at 4-8m telescopes, with high impact on the study of the evolution of galaxies, e.g. surveys like SAURON, ALTAS3D, CALIFA. Beyond the mere 2-dimensional mapping of extended objects, we have begun to explore the potential of IFS for PSF-fitting 3D...Go to contribution page
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Sergei Popov (Moscow State University)15/05/2015, 12:00SMFNS2015TalkWe apply a new method to probe evolution of the magnetic field of normal radio pulsars in the range of ages from several tens of thousand years to several hundred thousand years. It is demonstrated that in the period ~80000-300000 years the field decay by a factor ~2. We discuss how this evolution can be related to the Hall cascade and Hall attractor.Go to contribution page
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Tsvi Piran (The Hebrew University, Jerusalem, Israel)15/05/2015, 15:00SMFNS2015TalkA hundred years ago, when Karl Schwartzchild wrote his famous metric, he didn’t imagine that a monster, a black hole, is hidden within this metric and this monster can tidally disrupt and swallow a whole star. This question, how does a stellar tidal disruption by a black hole was addressed for the first time in the eighties and recently within the last decade we begun observing such events....Go to contribution page
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Peter Hess15/05/2015, 15:30STARS2015TalkAfter a brief résumé on pseudo-complex General Relativity (pc-GR), circular orbits and stable orbits in general are discussed, including predictions compared to observations. Using a modified version of a model for accretions disks, presented by Page and Thorne, we apply the raytracing technique, in order to simulate the appearance of an accretion disk as it appears in a detector. In pc-GR we...Go to contribution page
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Jorge Horvath (IAG-USP)15/05/2015, 16:00
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Jose Carlos Suarez Cortina (Higher Institute of Technologies and Applied Sciences, Havana, Cuba)STARS2015PosterSpontaneous symmetry breaking is essential for giving masses to non-Abelian gauge fields. It appears to be the only method which is available which is unitary and renormalizable in 4 dimensions. Sidney Coleman and Erick Weinberg investigate how radiative corrections, otherwise the loop corrections, can produce spontaneous symmetry breaking, in the kind of theory for which the semiclassical...Go to contribution page
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Wilmer D. Alfonso (Grupo de Física Atómica y Molecular, Instituto de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Antioquia UdeA, Calle 70 No. 52-21, Medellín, Colombia)STARS2015PosterThe electromagnetic radiation emitted from some astrophysical objects such as active galactic nuclei (AGNs), micro-quasars (M-QSRs), and central engines of gamma-ray burst (GRBs), seems to have a similar physical origin: a powerful jet of plasma ejected from a localized system, presumably composed of an accretion disk encircling a compact object. This radiation is generally beamed in the...Go to contribution page
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Aurora Perez Martinez (ICIMAF)SMFNS2015PosterThe fact that a magnetic field in a fermion system breaks the spherical symmetry suggest that the intrinsic geometry of this system is axisymmetric rather than spherical. In this work we analyze the impact of anisotropic pressures, due to the presence of a magnetic field, in the structure equations of a magnetized quark star. We assume a cylindrical metric and an anisotropic energy momentum...Go to contribution page
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