具有一级相变的大质量混合星
Massive hybrid stars with a first order phase transition
摘要:
我们发展了我们以前在中子星中对退禁闭夸克相变的研究,包括在禁闭密度依赖质量模型中夸克状态方程中的相互作用到微扰膨胀中的首阶。利用Gibbs条件,将强子-夸克混合相与微观Brueckner-Hartree-Fock近似下的强子状态方程相匹配,构造了强子-夸克混合相。详细讨论了夸克相互作用参数对致密中子星物质阈值性质和相图的影响。我们发现,领先阶夸克相互作用扩大了混合相的密度范围,推动了强子相的消失。此外,由于状态方程可能会变得更硬,一个高质量的混合星是可能的混合相核心与典型的参数集。
英文摘要:
We develop our previous study of the transition to deconfined quark phase in neutron stars, including the interaction in the quark equation of state to the leading order in the perturbative expansion within the confinement density-dependent mass model. Using the Gibbs conditions the hadron-quark mixed phase is constructed matching the latter with the hadron equation of state derived from the microscopic Brueckner-Hartree-Fock approximation. The influence of quark interaction parameters on threshold properties and phase diagram of dense neutron star matter are discussed in detail. We find that the leading-order quark interaction expands the density range of the mixed phase, pushing forward the disappearance of the hadron phase. Moreover, since the equation of state could turn out to be stiffer, a high-mass hybrid star is possible with mixed-phase core with typical parameter sets.
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