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arXiv 1302.3776nucl-th
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与致密星有关的核物质的phase diagram的某些方面

Some aspects of the phase diagram of nuclear matter relevant to compact stars

F. Gulminelli, Ad-R. Raduta, J. Margueron, P. Papakonstantinou, M. Oertel

摘要:

在核心坍缩超新星和中子星中可以发现的致密物质预计会表现出不同的相变,这会影响物质的组成和状态方程,对核心坍缩超新星爆炸的动力学和中子星的结构产生重要影响。在本文中,我们将解决两个这样的过渡,即壳核固-液过渡在亚饱和密度的具体现象,并在超饱和密度的存在下的超声波自由度的可能奇怪的过渡。关于中子星壳核相变在零和有限的温度下,它将被证明,作为一个结果的存在下的远程库仑相互作用,一个集群相预计是不可访问的巨正则系综。一个特定的准粒子模型将被引入,并将显示一些定量的结果有关的超新星动力学。在对应于中子星核心的更高密度下,超声波自由度的开放也修改了状态方程。一般的特点和顺序的相变在这个制度将分析的框架内的自洽的平均场方法。

英文摘要:

Dense matter as it can be found in core-collapse supernovae and neutron stars is expected to exhibit different phase transitions which impact the matter composition and the equation of state, with important consequences on the dynamics of core-collapse supernova explosion and on the structure of neutron stars. In this paper we will address the specific phenomenology of two of such transitions, namely the crust-core solid-liquid transition at sub-saturation density, and the possible strange transition at super-saturation density in the presence of hyperonic degrees of freedom. Concerning the neutron star crust-core phase transition at zero and finite temperature, it will be shown that, as a consequence of the presence of long-range Coulomb interactions, a clusterized phase is expected which is not accessible in the grand-canonical ensemble. A specific quasi-particle model will be introduced and some quantitative results relevant for the supernova dynamics will be shown. The opening of hyperonic degrees of freedom at higher densities corresponding to the neutron stars core also modifies the equation of state. The general characteristics and order of phase transitions in this regime will be analyzed in the framework of a self-consistent mean-field approach.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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