The constant-sound-speed parametrization for Nambu-Jona-Lasinio models of quark matter in hybrid stars

The discovery of pulsars as heavy as 2 solar masses has led astrophysicists to rethink the core compositions of neutron stars, ruling out many models for the nuclear equations of state (EoS). We explore the hybrid stars that occur when hadronic matter is treated in a relativistic mean-field approxim...

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Detalles Bibliográficos
Autores principales: Ranea Sandoval, Ignacio Francisco, Han, S., Orsaria, Milva Gabriela, Contrera, Gustavo Aníbal, Weber, F., Alford, M. G.
Formato: Articulo
Lenguaje:Inglés
Publicado: 2016
Materias:
Ciencias Astronómicas
Pulsar
Sonido
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/86215
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-86215
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Astronómicas
Pulsar
Sonido
spellingShingle Ciencias Astronómicas
Pulsar
Sonido
Ranea Sandoval, Ignacio Francisco
Han, S.
Orsaria, Milva Gabriela
Contrera, Gustavo Aníbal
Weber, F.
Alford, M. G.
The constant-sound-speed parametrization for Nambu-Jona-Lasinio models of quark matter in hybrid stars
topic_facet Ciencias Astronómicas
Pulsar
Sonido
description The discovery of pulsars as heavy as 2 solar masses has led astrophysicists to rethink the core compositions of neutron stars, ruling out many models for the nuclear equations of state (EoS). We explore the hybrid stars that occur when hadronic matter is treated in a relativistic mean-field approximation and quark matter is modeled by three-flavor local and nonlocal Nambu-Jona-Lasinio (NJL) models with repulsive vector interactions. The NJL models typically yield equations of state that feature a first-order transition to quark matter. Assuming that the quark-hadron surface tension is high enough to disfavor mixed phases and restricting to EoSs that allow stars to reach 2 solar masses, we find that the appearance of the quark-matter core either destabilizes the star immediately (this is typical for nonlocal NJL models) or leads to a very short hybrid star branch in the mass-radius relation (this is typical for local NJL models). Using the constant-sound-speed parametrization we can see that the reason for the near absence of hybrid stars is that the transition pressure is fairly high and the transition is strongly first order.
format Articulo
Articulo
author Ranea Sandoval, Ignacio Francisco
Han, S.
Orsaria, Milva Gabriela
Contrera, Gustavo Aníbal
Weber, F.
Alford, M. G.
author_facet Ranea Sandoval, Ignacio Francisco
Han, S.
Orsaria, Milva Gabriela
Contrera, Gustavo Aníbal
Weber, F.
Alford, M. G.
author_sort Ranea Sandoval, Ignacio Francisco
title The constant-sound-speed parametrization for Nambu-Jona-Lasinio models of quark matter in hybrid stars
title_short The constant-sound-speed parametrization for Nambu-Jona-Lasinio models of quark matter in hybrid stars
title_full The constant-sound-speed parametrization for Nambu-Jona-Lasinio models of quark matter in hybrid stars
title_fullStr The constant-sound-speed parametrization for Nambu-Jona-Lasinio models of quark matter in hybrid stars
title_full_unstemmed The constant-sound-speed parametrization for Nambu-Jona-Lasinio models of quark matter in hybrid stars
title_sort constant-sound-speed parametrization for nambu-jona-lasinio models of quark matter in hybrid stars
publishDate 2016
url http://sedici.unlp.edu.ar/handle/10915/86215
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