Kavli Affiliate: Renxin Xu
| First 5 Authors: Wen-Li Yuan, Wen-Li Yuan, , ,
| Summary:
We extend the modified Nambu-Jona-Lasinio (NJL) model — incorporating
exchange interactions via the Fierz transformation — to finite temperatures in
both two- and three-flavor scenarios, and investigate the properties of
protoquark stars in $beta$-equilibrium. Our results show that increasing the
strength of exchange interactions, characterized by the parameter $alpha$,
changes the chiral phase transition from first-order to crossover. We examine
the effects of finite temperature, lepton fraction, and exchange interactions
on the equation of state (EOS), finding that the EOS in the crossover regime is
significantly stiffer than in the first-order case. In certain regions of
parameter space within the crossover scenario, strange quark matter can support
the existence of twin star configurations.
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