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arXiv 1001.1709nucl-thastro-ph.SR
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质子中子星的退禁闭跃迁:Nambu-Jona-Lasinio模型的分析

Deconfinement transition in protoneutron stars: analysis within the Nambu-Jona-Lasinio model

G. Lugones, T. A. S. do Carmo, A. G. Grunfeld, N. N. Scoccola

摘要:

研究了色超导和中微子俘获对质子中子星中强子物质向夸克物质的去禁闭跃迁的影响。为了描述强相互作用的物质,采用了两相图。对于强子相,我们使用不同的参数化的非线性Walecka模型,其中包括整个重子八重态。对于夸克物质相,我们使用一个$SU(3)_f$ Nambu-Jona-Lasinio有效模型,其中包括色超导性。在跃迁过程中,我们采用了色味守恒的方法,使得刚解除束缚的夸克物质相对于弱相互作用暂时脱离平衡。我们发现中微子含量越小,解除禁闭越困难,温度越低,解除禁闭越容易,尽管这些影响并不太大。此外,当质子中子星冷却和去质子化时,它们会相互抵消,导致质子中子星演化过程中的跃迁密度大致恒定。根据这些结果,在质子中子星的大量冷却和收缩之后,解除禁闭的转变是有利的。

英文摘要:

We study the effect of color superconductivity and neutrino trapping on the deconfinement transition of hadronic matter into quark matter in a protoneutron star. To describe the strongly interacting matter a two-phase picture is adopted. For the hadronic phase we use different parameterizations of a non-linear Walecka model which includes the whole baryon octet. For the quark matter phase we use an $SU(3)_f$ Nambu-Jona-Lasinio effective model which includes color superconductivity. We impose color and flavor conservation during the transition in such a way that just deconfined quark matter is transitorily out of equilibrium with respect to weak interactions. We find that deconfinement is more difficult for small neutrino content and it is easier for lower temperatures although these effects are not too large. In addition they will tend to cancel each other as the protoneutron star cools and deleptonizes, resulting a transition density that is roughly constant along the evolution of the protoneutron star. According to these results the deconfinement transition is favored after substantial cooling and contraction of the protoneutron star.

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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