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

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

Ref.: Physical Review C 82, 015809 (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.