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1. Transformation from hadronic to quark matter in neutron stars: a comparison of two scenarios | |||
Shao Guo-yun | |||
Physics 27 May 2017 | |||
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Abstract: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. | |||
TO cite this article:Shao Guo-yun . Transformation from hadronic to quark matter in neutron stars: a comparison of two scenarios[OL].[27 May 2017] http://en.paper.edu.cn/en_releasepaper/content/4735909 |
2. Phase diagram of strongly interacting matter in the improved PNJL model | |||
TANG Zhan-duo,SHAO Guo-yun | |||
Physics 25 May 2017 | |||
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Abstract:Both the chemical potential modification on the Polyakov effectivepotential and the entanglement interactions between the Polyakov-loop and chiral condensate are considered to improved the Polyakov-Nambu-Jona-Lasinio model (PNJL model), which is named the $mu$EPNJL model. Compared with the standard PNJL model, the calculation shows that the range of chiral symmetry phase transition is greatly enlarged in the modified model. The chiral symmetry restoration and deconfinement coincide in a wide range in the $T-mu$ phase diagram, and the critical end point moves towards a smaller chemical potential and higher temperature. Besides, the measurement of the moments of net-proton multiplicity distributions at Relativistic hints that some critical behaviors possibly exists, which also provides a constraint on the relevant model parameters. | |||
TO cite this article:TANG Zhan-duo,SHAO Guo-yun. Phase diagram of strongly interacting matter in the improved PNJL model[OL].[25 May 2017] http://en.paper.edu.cn/en_releasepaper/content/4735961 |
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