Artículos de revistas
Self-bound interacting QCD matter in compact stars
Fecha
2012Registro en:
PHYSICAL REVIEW D, COLLEGE PK, v. 86, n. 6, supl. 2, Part 3, pp. 1522-1527, SEP 25, 2012
1550-7998
10.1103/PhysRevD.86.065031
Autor
Franzon, Bruno Cezar de Souza
Fogaça, David Augaitis
Navarra, Fernando Silveira
Horvath, Jorge Ernesto
Institución
Resumen
The quark gluon plasma (QGP) at zero temperature and high baryon number is a system that may be present inside compact stars. It is quite possible that this cold QGP shares some relevant features with the hot QGP observed in heavy ion collisions, being also a strongly interacting system. In a previous work we have derived from the QCD Lagrangian an equation of state (EOS) for the cold QGP, which can be considered an improved version of the MIT bag-model EOS. Compared to the latter, our EOS reaches higher values of the pressure at comparable baryon densities. This feature is due to perturbative corrections and also to nonperturbative effects. Here we apply this EOS to the study of neutron stars, discussing the absolute stability of quark matter and computing the mass-radius relation for self-bound (strange) stars. The maximum masses of the sequences exceed two solar masses, in agreement with the recently measured values of the mass of the pulsar PSR J1614-2230, and the corresponding radii of around 10-11 km.