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Exploring the first-order phase transition in neutron stars using the parity doublet model and NJL-type quark model

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arxiv 2407.13990 v1 pith:LKB5X2ZN submitted 2024-07-19 nucl-th

Bikai Gao , Wen-Li Yuan , Masayasu Harada , Yong-Liang Ma This is my paper
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keywords phasetransitionfirst-ordermodelmodelsquarkdoublethadronic
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abstract

We investigate the possibility and impacts of a first-order phase transition from hadronic matter to quark matter in neutron stars (NSs) using two specific models: the parity doublet model (PDM) for the hadronic phase and the Nambu-Jona-Lasinio (NJL) type model for the quark phase. By combining these models, we construct hybrid equations of state (EOSs) that capture the transition between the two phases. We explore the parameter space of both models to identify the conditions under which a first-order phase transition can occur and study its effects on NS properties. We identify the suitable parameter space and constrain the onset density of the first-order phase transition. For $m_0$ = 500 MeV -- the chiral invariant mass in PDM, the phase transition occurs between 1.9$n_0$ and 2.95$n_0$ and ends between 2.1$n_0$ and 3.6$n_0$. Increasing $m_0$ to 600 MeV shifts the phase transition to higher densities, occurring between 2.9$n_0$ and 4.1$n_0$ and ending between 3.4$n_0$ and 4.6$n_0$.

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Cited by 6 Pith papers

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  1. The Non-parametric Equation of State Realizes a Generalized Quark-Hadron Crossover

    astro-ph.HE 2026-05 unverdicted novelty 7.0 of 10

    Non-parametric EOS construction from crust to pQCD forces a sound-speed peak and softening that realizes a generalized quark-hadron crossover in massive neutron stars.

  2. Scalar diquarks in the QCD vacuum

    hep-ph 2026-06 unverdicted novelty 6.0 of 10

    A first-principles FRG approach to two-flavor QCD derives low-energy constants for the pion, sigma-meson and scalar diquark without parameters beyond QCD itself, including new diquark properties for color-superconduct...

  3. The Non-parametric Equation of State Realizes a Generalized Quark-Hadron Crossover

    astro-ph.HE 2026-05 unverdicted novelty 6.0 of 10

    Non-parametric EOS construction shows non-conformal behavior with evidence for soft quark matter and a hadron-quark phase transition in massive neutron star cores.

  4. Suppression of dynamical momentum-space shell by chiral symmetry

    nucl-th 2025-09 conditional novelty 6.0 of 10

    In a parity doublet model, self-consistent minimization keeps the quark fraction at zero up to about 8n0, showing quark onset and chiral restoration need not coincide.

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