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arXiv 0706.3243astro-ph
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中子星核的夸克退禁闭与中性物质的基态

Quark deconfinement in neutron star cores and the ground state of neutral matter

Chang-Qun Ma, Chun-Yuan Gao

摘要:

在中子星核中是否存在非受限夸克相,并代表中等密度中性物质的基态,这是一个悬而未决的问题。我们采用了两个现实的有效夸克模型,三味Nambu-Jona-Lasinio模型和修正的夸克-介子耦合模型来描述中子星物质。在构造了可能的具有非成对或色超导夸克相位的混合状态方程后,系统地讨论了中子星对混合状态方程的观测约束。结果表明,具有纯夸克物质核的中子星是不稳定的,并且不存在含有超子的强子相,而具有双色超导相和不成对夸克物质相的混合型EOS都受到Ter 5 I和EXO 0748-676两颗星的严格和最可靠的约束.与最大质量的脉冲星PSR J 0751 +1807的最严格约束相比,不成对夸克物质相的混合物态方程是允许的。因此,我们认为中性物质在中等密度下的基态很可能处于退禁闭夸克相。

英文摘要:

Whether or not deconfined quark phase exists in neutron star cores and represents the ground state of neutral matter at moderate densities are open questions. We use two realistic effective quark models, the three-flavor Nambu-Jona-Lasinio model and the modified quark-meson coupling model, to describe the neutron star matter. After constructing possible hybrid equations of state (EOSes) with unpaired or color superconducting quark phase, we systematically discuss the observational constraints of neutron stars on the EOSes. It is found that the neutron star with pure quark matter core is unstable and the hadronic phase with hyperons is denied, while hybrid EOSes with two-flavor color superconducting phase or unpaired quark matter phase are both allowed by the tight and most reliable constraints from two stars Ter 5 I and EXO 0748-676. And the hybrid EOS with unpaired quark matter phase is allowed even compared with the tightest constraint from the most massive pulsar star PSR J0751+1807. Therefore, we conclude that the ground state of neutral matter at moderate densities is in deconfined quark phase likely.

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