Deconfinement transition in protoneutron stars: Analysis within the Nambu-Jona-Lasinio model
Deconfinement transition in protoneutron stars: Analysis within the Nambu-Jona-Lasinio model
复制标题
原中子星的解禁转变：Nambu-Jona-Lasinio 模型中的分析
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
N. Scoccola
中科院分区：
文献类型：
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作者：
G. Lugones;T. A. S. D. Carmo;A. G. Grunfeld;N. Scoccola
我们研究了彩色超导性和中微子俘获对原中子星中强子物质向夸克物质的解约束转变的影响。为了描述强相互作用的物质，采用两相图。对于强子阶段，我们使用非线性 Walecka 模型的不同参数化，其中包括整个重子八位组。对于夸克物质相，我们使用 SU(3){sub f} Nambu-Jona-Lasinio 有效模型，其中包括颜色超导性。我们在转变过程中施加颜色和味道守恒，使得解禁夸克物质在弱相互作用方面暂时失去平衡。我们发现，对于较小的中微子含量，解除限制更加困难，而对于较低的温度，解除限制则更容易，尽管这些影响并不太大。此外，随着原中子星冷却和去轻子化，它们往往会相互抵消，从而产生沿着原中子星演化过程大致恒定的跃迁密度。根据这些结果，在原中子星显着冷却和收缩之后，有利于解约束转变。
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 parametrizations of a nonlinear Walecka model which includes the whole baryon octet. For the quark-matter phase we use an SU(3){sub 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.