Compact stars with a quark core within the Nambu--Jona-Lasinio (NJL) model

Compact stars with a quark core within the Nambu–Jona-Lasinio (NJL) model

C. H. Lenzi, A. S. Schneider, C. Providência, and R. M. Marinho, Jr.

Phys. Rev. C 82, 015809 – Published 29 July 2010

Abstract

An ultraviolet cutoff dependent on the chemical potential as proposed by Casalbuoni et al. is used in the SU(3) Nambu–Jona-Lasinio model. The model is applied to the description of stellar quark matter and compact stars. It is shown that with a new cutoff parametrization it is possible to obtain stable hybrid stars with a quark core. A larger cutoff at finite densities leads to a partial chiral symmetry restoration of quark $s$ at lower densities. A direct consequence is the onset of the $s$ quark in stellar matter at lower densities and a softening of the equation of state.

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Received 19 January 2010

DOI:https://doi.org/10.1103/PhysRevC.82.015809

Authors & Affiliations

C. H. Lenzi^1,2, A. S. Schneider³, C. Providência², and R. M. Marinho, Jr.¹

¹Departamento de Física, Instituto Tecnológico de Aeronáutica, Campo Montenegro, São José dos Campos, SP, 12228-900, Brazil
²Centro de Física Computacional, Department of Physics, University of Coimbra, Rua Larga, Coimbra, P-3004-516, Portugal
³Department of Physics, Indiana University, Swain Hall West 117, 727 East Third Street Bloomington, Indiana 47405, USA

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Issue

Vol. 82, Iss. 1 — July 2010

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Physical Review C

covering nuclear physics