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arXiv 1207.4872astro-ph.HEnucl-th
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脉冲星PSR J1614-2230光下具有混合相区的混合星的最大质量

Maximum mass of a hybrid star having a mixed phase region in the light of pulsar PSR J1614-2230

Ritam Mallick

摘要:

最近对质量约为2个太阳质量的脉冲星PSR J1614-2230的观测对描述极端条件下恒星的物质状态方程提出了严格的约束。中子星(NS)可以达到PSR J1614-2230规定的质量极限。但是具有超子的恒星或具有玻色子凝聚的夸克星(QS),具有较软的EOS几乎不能达到这样的极限,并被排除在外。如果不考虑强耦合常数或色超导的影响,纯奇异物质的QS也不可能有如此高的质量。在这项工作中,我试图计算的质量上限的混合星(HS)具有夸克强子混合相。强子物质(含超子)物态方程用相对论平均场论描述,夸克相用简单的MIT袋模型。我使用Glendenning构造来构造中间混合相。具有混合相的HS不能达到PSR J1614-2230设定的质量限值,除非我假设密度依赖性袋常数。在这种情况下,混合相区域很小。用这种混合相区得到的混合混合星的最大质量为$2.01 M_{\odot}$。

英文摘要:

Recent observation of pulsar PSR J1614-2230 with mass about 2 solar masses poses a severe constraint on the equations of state (EOS) of matter describing stars under extreme conditions. Neutron stars (NS) can reach the mass limits set by PSR J1614-2230. But stars having hyperons or quark stars (QS) having boson condensates, with softer EOS can barely reach such limits and are ruled out. QS with pure strange matter also cannot have such high mass unless the effect of strong coupling constant or colour superconductivity are taken into account. In this work I try to calculate the upper mass limit for a hybrid stars (HS) having a quark-hadron mixed phase. The hadronic matter (having hyperons) EOS is described by relativistic mean field theory and for the quark phase I use the simple MIT bag model. I construct the intermediate mixed phase using Glendenning construction. HS with a mixed phase cannot reach the mass limit set by PSR J1614-2230 unless I assume a density dependent bag constant. For such case the mixed phase region is small. The maximum mass of a mixed hybrid star obtained with such mixed phase region is $2.01 M_{\odot}$.

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