Generic conditions for stable hybrid stars
Generic conditions for stable hybrid stars
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DOI：
10.1103/physrevd.88.083013
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发表时间：
2013-02
影响因子：
5
通讯作者：
M. Alford;Sophia Han;M. Prakash
中科院分区：
文献类型：
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作者：
M. Alford;Sophia Han;M. Prakash
我们研究混合星的质量半径曲线，假设核物质和夸克物质之间存在单一一级相变，夸克物质核心和核物质地幔之间有清晰的界面。我们使用夸克物质状态方程的通用参数化，该方程具有常数，即与密度无关的声速（“CSS”）。我们认为这种参数化为夸克物质模型的比较和实证测试提供了一个框架。我们获得了混合星质量半径关系的可能形式的相图，其中控制参数是转变压力、能量密度不连续性和夸克物质声速。我们发现该图对夸克物质参数敏感，但对核物质状态方程的细节相当不敏感。我们计算了最大混合星质量作为夸克物质 EoS 参数的函数，并发现这些参数存在合理的值，可以产生质量超过 $2\,M_\odot$ 的混合星。
We study the mass-radius curve of hybrid stars, assuming a single first-order phase transition between nuclear and quark matter, with a sharp interface between the quark matter core and nuclear matter mantle. We use a generic parameterization of the quark matter equation of state, which has a constant, i.e. density-independent, speed of sound ("CSS"). We argue that this parameterization provides a framework for comparison and empirical testing of models of quark matter. We obtain the phase diagram of possible forms of the hybrid star mass-radius relation, where the control parameters are the transition pressure, energy density discontinuity, and the quark matter speed of sound. We find that this diagram is sensitive to the quark matter parameters but fairly insensitive to details of the nuclear matter equation of state. We calculate the maximum hybrid star mass as a function of the parameters of the quark matter EoS, and find that there are reasonable values of those parameters that give rise to hybrid stars with mass above $2\,M_\odot$.