81 research outputs found
Preliminary EoS for core-collapse supernova simulations with the QMC model
In this work we present the preliminary results of a complete equation of
state (EoS) for core-collapse supernova simulations. We treat uniform matter
made of nucleons using the the quark-meson coupling (QMC) model. We show a
table with a variety of thermodynamic quantities, which covers the proton
fraction range with the linear grid spacing
( points) and the density range g.cm with
the logarithmic grid spacing g.cm
( points). This preliminary study is performed at zero temperature and our
results are compared with the widely used EoS already available in the
literature
Phase transition and critical end point driven by an external magnetic field in asymmetric quark matter
The location of the critical end point (CEP) in the QCD phase diagram is
determined under different scenarios. The effect of strangeness, isospin/charge
asymmetry and an external magnetic field is investigated. The discussion is
performed within the 2+1 flavor Nambu--Jona-Lasinio model with Polyakov loop.
It is shown that isospin asymmetry shifts the CEP to larger baryonic chemical
potentials and smaller temperatures. At large asymmetries the CEP disappears.
However, a strong enough magnetic field drives the system into a first order
phase transition.Comment: 7 pages, 3 figures; PRD versio
Gravitational Wave Signatures of Highly Magnetized Neutron Stars
Motivated by the recent gravitational wave detection by the LIGO-VIRGO
observatories, we study the Love number and dimensionless tidal polarizability
of highly magnetized stars. We also investigate the fundamental quasi-normal
mode of neutron stars subject to high magnetic fields. To perform our
calculations we use the chaotic field approximation and consider both nucleonic
and hyperonic stars. As far as the fundamental mode is concerned, we conclude
that the role played by the constitution of the stars is far more relevant than
the intensity of the magnetic field and if massive stars are considered, the
ones constituted by nucleons only present frequencies somewhat lower than the
ones with hyperonic cores, a feature that can be used to point out the real
internal structure of neutron stars. Moreover, our studies clearly indicate
that strong magnetic fields play a crucial role in the deformability of low
mass neutron stars, with possible consequences on the interpretation of the
detected gravitational waves signatures.Comment: 24 pages, 4 figures, 6 table
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