Artículo
Constant-sound-speed parametrization for Nambu-Jona-Lasinio models of quark matter in hybrid stars
Ranea Sandoval, Ignacio Francisco
; Han, Sophia; Orsaria, Milva Gabriela
; Contrera, Gustavo Aníbal Gabriel
; Fridolin, Weber; Alford, Mark G.
Fecha de publicación:
04/2016
Editorial:
American Physical Society
Revista:
Physical Review C
ISSN:
2469-9993
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
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.
Palabras clave:
Hybrid Stars
,
Njl Models
,
Constant-Sound-Speed Parametrization
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Articulos(CCT - LA PLATA)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - LA PLATA
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - LA PLATA
Articulos(IFLP)
Articulos de INST.DE FISICA LA PLATA
Articulos de INST.DE FISICA LA PLATA
Citación
Ranea Sandoval, Ignacio Francisco; Han, Sophia; Orsaria, Milva Gabriela; Contrera, Gustavo Aníbal Gabriel; Fridolin, Weber; et al.; Constant-sound-speed parametrization for Nambu-Jona-Lasinio models of quark matter in hybrid stars; American Physical Society; Physical Review C; 93; 4; 4-2016; 1-12
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