arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2008.13608astro-ph.HEnucl-th
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核坍缩超新星模拟中轻重核团簇的介质修正--对物态方程和弱相互作用的影响

Medium modifications for light and heavy nuclear clusters in simulations of core collapse supernovae -- Impact on equation of state and weak interactions

Tobias Fischer, Stefan Typel, Gerd Röpke, Niels-Uwe F. Bastian, Gabriel Martínez-Pinedo

摘要:

本文基于一个新发展的核塌缩超新星状态方程,研究了重核团簇和弱束缚轻核团簇的作用。提出了一种新的核团簇描述方法,该方法考虑了准粒子方法和连续关联。它表明,通常采用的核统计平衡的方法,基于非相互作用的粒子,轻和重的集群的描述变得无效的温暖的核物质的饱和密度附近。这对研究核心坍缩超新星有重要意义。为此,我们实现这个核物质状态方程提供了任意温度,重子密度和同位旋不对称性,球对称的核心坍缩超新星模拟,以研究动力学的影响,以及对中微子的排放。对于包含一组弱过程,涉及轻集群的速率表达式推导,包括介质修改的平均场水平。一个实质性的影响,从列入各种弱反应,涉及轻集团的反弹后的动力学,也不是中微子发射无法找到。

英文摘要:

The present article investigates the role of heavy nuclear clusters and weakly bound light nuclear clusters based on a newly developed equation of state for core collapse supernova studies. A novel approach is brought forward for the description of nuclear clusters, taking into account the quasiparticle approach and continuum correlations. It demonstrates that the commonly employed nuclear statistical equilibrium approach, based on non-interacting particles, for the description of light and heavy clusters becomes invalid for warm nuclear matter near the saturation density. This has important consequences for studies of core collapse supernovae. To this end, we implement this nuclear equation of state provided for arbitrary temperature, baryon density and isospin asymmetry, to spherically symmetric core collapse supernova simulations in order to study the impact on the dynamics as well as on the neutrino emission. For the inclusion of a set of weak processes involving light clusters the rate expressions are derived, including medium modifications at the mean field level. A substantial impact from the inclusion of a variety of weak reactions involving light clusters on the post bounce dynamics nor on the neutrino emission could not be found.

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