Compact Stars with Sequential QCD Phase Transitions.
Compact Stars with Sequential QCD Phase Transitions.
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DOI：
10.1103/physrevlett.119.161104
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发表时间：
2017-06
影响因子：
8.6
通讯作者：
M. Alford;A. Sedrakian
中科院分区：
文献类型：
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作者：
M. Alford;A. Sedrakian
致密恒星内部可能含有密度超过核饱和密度数倍的夸克物质。我们探索这种紧凑型恒星的模型，其中有两个一级相变：第一个从核物质到夸克物质相，其次是在更高的密度下，另一个一级相变到不同的夸克物质相[例如，从双味色超导（2SC）到色味锁定（CFL）相]。我们表明，这可以产生两个独立的分支的混合星，彼此分开，并从核分支的不稳定区域，因此，一个新的家庭的紧凑型恒星，密度比普通的混合星。在一定的参数范围内，我们可以得到双混合星（质量相同但半径不同的混合星），甚至三胞胎，其中三颗恒星的内核分别是核物质、2SC物质和CFL物质，它们都具有相同的质量但半径不同。
Compact stars may contain quark matter in their interiors at densities exceeding several times the nuclear saturation density. We explore models of such compact stars where there are two first-order phase transitions: the first from nuclear matter to a quark-matter phase, followed at a higher density by another first-order transition to a different quark-matter phase [e.g., from the two-flavor color-superconducting (2SC) to the color-flavor-locked (CFL) phase]. We show that this can give rise to two separate branches of hybrid stars, separated from each other and from the nuclear branch by instability regions, and, therefore, to a new family of compact stars, denser than the ordinary hybrid stars. In a range of parameters, one may obtain twin hybrid stars (hybrid stars with the same masses but different radii) and even triplets where three stars, with inner cores of nuclear matter, 2SC matter, and CFL matter, respectively, all have the same mass but different radii.