π介子和超子对恒星黑洞形成的影响
Influence of pions and hyperons on stellar black hole formation
摘要：
本文采用球对称的广义相对论流体力学方法对恒星核坍缩过程进行了数值模拟，直至黑洞形成。利用CoCoNuT程序，采用新发展的灰泄漏中微子处理方案，研究了在高密度和高温度下状态方程中加入π介子和Λ超子对黑洞形成过程的影响.结果表明，没有任何附加粒子的参考状态方程模型和扩展的模型之间的差异不可忽略。对于后者，原中子星所支持的最大质量较小，坍缩成黑洞的时间较早。一个相变到hyperonic物质时，祖允许一个足够高的吸积率到原中子星。从这些坍缩的中微子光度的粗略估计，也。
英文摘要：
We present numerical simulations of stellar core-collapse with spherically symmetric, general relativistic hydrodynamics up to black hole formation. Using the CoCoNuT code, with a newly developed grey leakage scheme for the neutrino treatment, we investigate the effects of including pions and Λ-hyperons into the equation of state at high densities and temperatures on the black hole formation process. Results show non-negligible differences between the models with reference equation of state without any additional particles and models with the extended ones. For the latter, the maximum masses supported by the proto-neutron star are smaller and the collapse to a black hole occurs earlier. A phase transition to hyperonic matter is observed when the progenitor allows for a high enough accretion rate onto the proto-neutron star. Rough estimates of neutrino luminosity from these collapses are given, too.
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