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arXiv 1107.2638nucl-thastro-ph.SRnucl-ex
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内中子星壳的质子分数

Proton fraction in the inner neutron-star crust

J. Piekarewicz, G. Toledo Sanchez

摘要:

对A=5,000个核子的系统进行了与内中子星壳有关的富中子物质的蒙特卡罗模拟。为了确定内地壳中的质子分数,对各种密度和质子分数进行了数值模拟。我们得出结论-鉴于所谓的“核面食”阶段在恒星地壳的发展作为质子之间的远程库仑相互作用的结果,我们的问题面食的形成是否可能在这样的质子贫乏的环境。为了回答这个问题,我们寻找敏感的球形核和异国情调的面食结构之间的过渡的物理观测。特别相关的是静态结构因子S(k)-一个对密度波动敏感的观测值。然而,在S(k)中没有观察到显著的行为。我们认为识别物理观测敏感的存在-或缺乏-在质子贫乏的环境中作为一个开放的问题至关重要的面食阶段。

英文摘要:

Monte Carlo simulations of neutron-rich matter of relevance to the inner neutron-star crust are performed for a system of A=5,000 nucleons. To determine the proton fraction in the inner crust, numerical simulations are carried out for a variety of densities and proton fractions. We conclude---as others have before us using different techniques---that the proton fraction in the inner stellar crust is very small. Given that the purported "nuclear pasta" phase in stellar crusts develops as a consequence of the long-range Coulomb interaction among protons, we question whether pasta formation is possible in such proton-poor environments. To answer this question, we search for physical observables sensitive to the transition between spherical nuclei and exotic pasta structures. Of particular relevance is the static structure factor S(k)---an observable sensitive to density fluctuations. However, no dramatic behavior was observed in S(k). We regard the identification of physical observables sensitive to the existence---or lack-thereof---of a pasta phase in proton-poor environments as an open problem of critical importance.

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