Tsvi Piran
(The Hebrew University, Jerusalem, Israel)
10/05/2015, 09:00
STARS2015
Talk
Beyond 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...
Thomas Boller
(M)
10/05/2015, 09:40
STARS2015
Talk
modified theory of gravitation,
observational test, black hole imaging
Peter Hess
10/05/2015, 10:40
SMFNS2015
Talk
The 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...
Roberto SUSSMAN
(ICN-UNAM, Mexico)
10/05/2015, 11:20
STARS2015
Talk
We 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...
Eduardo Guendelman
(Ben Gurion University)
10/05/2015, 12:00
STARS2015
Talk
A 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...
Jürgen Struckmeier
(GSI)
10/05/2015, 14:00
STARS2015
Talk
It 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...
Kenneth Nordtvedt
(Montana State University)
10/05/2015, 14:40
STARS2015
Talk
A 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...
Gabriella Piccinelli
(Centro Tecnológico, FES Aragón, UNAM, México)
10/05/2015, 16:20
SMFNS2015
Talk
Magnetic 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...
Maciek Wielgus
(Nicolaus Copernicus Astronomical Center, Polish Academy of Sciences)
10/05/2015, 16:50
STARS2015
Talk
I 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.
Thomas Curtright
10/05/2015, 17:30
STARS2015
Talk
I 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...
Andres Escala
(Universidad de Chile)
10/05/2015, 18:00
STARS2015
Talk
Black Hole Astrophysics -
Gravitational Radiation -
Galactic Mergers
Cristina Biino
(INFN Torino (IT))
11/05/2015, 09:00
STARS2015
Talk
The 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...
Geraldine Conti
(CERN)
11/05/2015, 09:40
STARS2015
Talk
The 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...
Katharina Mueller
(Universitaet Zuerich (CH))
11/05/2015, 10:40
STARS2015
Talk
The 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...
Horst Stoecker
(Frankfurt Institute for Advanced Studies - FIAS and Institut fuer Theoretische Physik - ITP, Frankfurt am Main, Germany)
11/05/2015, 11:20
STARS2015
Talk
Upcoming 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.
Ulisses Barres de Almeida
(Centro Brasileiro de Pesquisas Físicas)
11/05/2015, 12:00
STARS2015
Talk
Gamma-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...
Martin Roth
11/05/2015, 14:00
STARS2015
Talk
The 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...
Hans Zinnecker
(Univ. Stuttgart)
11/05/2015, 14:40
STARS2015
Talk
SOFIA, 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...
Carola Dobrigkeit
(UNICAMP, Brazil)
11/05/2015, 15:20
STARS2015
Talk
The 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...
Laura Molina Bueno
(Universidad de Granada)
11/05/2015, 16:20
STARS2015
Talk
The 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...
Massimo Della Valle
(Osservatorio Astronomico di Capodimonte - Istituto Nazionale di Astrofisica - INAF, Napoli, Italy)
11/05/2015, 16:50
STARS2015
Talk
We 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.
Joerg Aichelin
(Subatech/CNRS)
12/05/2015, 09:00
STARS2015
Talk
During 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...
Elena Bratkovskaya
(FIAS)
12/05/2015, 09:40
STARS2015
Talk
We 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...
Marcus Bleicher
(Uni Frankfurt & FIAS)
12/05/2015, 10:40
STARS2015
Talk
We 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....
Werner Becker
(Max Planck fur Extraterrestrische Physik - MPE, Garching, Germany)
12/05/2015, 11:20
STARS2015
Talk
An 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...
German Lugones
(UFABC)
12/05/2015, 12:00
STARS2015
Talk
According 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...
Rodrigo Negreiros
(Universidade Federal Fluminense)
12/05/2015, 14:00
STARS2015
Talk
Braking index of Young Neutron Stars.
Sergei Popov
(Moscow State University)
12/05/2015, 14:40
STARS2015
Talk
We 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...
Lino Miramonti
(Physics Department of Milano University and Istituto Nazionale di Fisica Nucleare - INFN, Italy)
12/05/2015, 15:20
STARS2015
Talk
Borexino 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...
Zhaosheng Li
(Peking University)
12/05/2015, 16:20
STARS2015
Talk
Photospheric 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...
Alejandro Cabo Montes de Oca
(ICIMAF)
14/05/2015, 09:30
SMFNS2015
Talk
The 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...
Hugo Pérez Rojas
(Institute of Cybernetics, Mathematics and Physics)
14/05/2015, 10:00
STARS2015
Talk
For 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.
Eduardo Guendelman
(Ben Gurion University)
14/05/2015, 11:00
SMFNS2015
Talk
A 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 subject
Jorge Luis Acosta Avalo
(INSTEC)
14/05/2015, 11:30
SMFNS2015
Talk
We 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...
Dr
Aurora Pérez Martínez
(ICIMAF),
Lidice Cruz Rodríguez
(Havana University)
14/05/2015, 11:45
STARS2015
Talk
The 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.
Diana Alvear Terrero
(Facultad de Física, Universidad de La Habana),
Miguel Castillo García
(Facultad de Física, Universidad de la Habana)
14/05/2015, 12:00
SMFNS2015
Talk
We 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...
Dario León
(Facultad de Física, Universidad de La Habana)
14/05/2015, 12:15
STARS2015
Talk
We 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....
Augusto González
(Instituto de Cibernética, Matemática y Física, La Habana)
14/05/2015, 15:00
STARS2015
Talk
We 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.
Osmel Martin
14/05/2015, 15:30
STARS2015
Talk
Habitable planets,
stellar explosions,
the role of O2/O3 system,
biological implications
Jorge Horvath
(IAG-USP)
14/05/2015, 16:00
SMFNS2015
Talk
Evolution of magnetic fields in accreting neutron star systems
Daryel Manreza Paret
(Facultad de Fisica Universidad de la Habana)
15/05/2015, 09:30
SMFNS2015
Talk
The 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 >...
Gao Zhi Fu
(Xinjiang Astronomical Observatory, Chinese Academy of Sciences),
Wang Na
(Xinjiang Astronomical Observatory, Chinese Academy of Sciences)
15/05/2015, 10:00
SMFNS2015
Talk
Based 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...
Hao Tong
(Xinjiang Astronomical Observatory, Chinese Academy of Sciences)
15/05/2015, 11:00
SMFNS2015
Talk
Magnetars 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...
Martin Roth
15/05/2015, 11:30
SMFNS2015
Talk
Over 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...
Sergei Popov
(Moscow State University)
15/05/2015, 12:00
SMFNS2015
Talk
We 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.
Tsvi Piran
(The Hebrew University, Jerusalem, Israel)
15/05/2015, 15:00
SMFNS2015
Talk
A 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....
Jose Carlos Suarez Cortina
(Higher Institute of Technologies and Applied Sciences, Havana, Cuba)
STARS2015
Poster
Spontaneous 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...
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)
STARS2015
Poster
The 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...
Aurora Perez Martinez
(ICIMAF)
SMFNS2015
Poster
The 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...
