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| We investigate the hadron-quark transformation in dense neutron star matter with two different scenarios: the conventional first-order phase transition and a phenomenological smooth crossover transition. In the first-order transition scenario, the phase equilibrium is constructed based on Gibbs criteria. However, in the smooth crossover scheme, due to the overlap of nucleons and quark percolation at intermediate density, the thermodynamics of the strongly correlated system in the transition region includes the contributions from both hadronic and quark degrees of freedom. Both the first-order and crossover transition scenarios show that therepulsive vector interaction plays an crucial role in the phase transition, but their requirements on the couplingstrength are different to produce a massive hybrid neutron star comparable with the precisely measured masses of PSR J1614-2230 and PSR J0348+0432. Furthermore, we analysis the relevance of this studyto heavy-ion collision physics, and proposed some suggestions to distinguish the two scenarios and constraint the strength of quark vector interaction. |
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| Keywords:Intermediate and high energy nuclear physics; Equation of state of neutron star matter; Hadron-quark phase transition |
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