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arXiv 1901.07550nucl-th
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中子星物质元激发中超流中子与超流质子的耦合

Coupling between superfluid neutrons and superfluid protons in the elementary excitations of neutron star matter

M. Baldo, C. Ducoin

摘要:

在中子星中发生的几种现象受到表征恒星物质的元激发的影响。特别是低能激发在中微子的发射和传播、中子星的冷却和输运过程中起着重要作用。本文考虑了质子和中子都是超流的恒星区域的基元模。在库仑相互作用和核相互作用的基础上,我们研究了质子、中子和电子的整体谱函数。这项研究是在随机相近似的框架下进行的,推广到超流系统。我们使用的形式确保广义沃德等式得到满足。我们着重于中子和质子之间的耦合。一方面,这种耦合导致同时涉及中子和质子的集体模式,另一方面,它产生激发的阻尼。这两种效应在物质不同成分的光谱函数中特别明显。在高密度下,虽然中子和质子倾向于发展独立的激发,如谱函数所示,但中子-质子耦合仍然产生强阻尼的模式。

英文摘要:

Several phenomena occurring in neutron stars are affected by the elementary excitations that characterize the stellar matter. In particular, low-energy excitations can play a major role in the emission and propagation of neutrinos, neutron star cooling and transport processes. In this paper, we consider the elementary modes in the star region where both proton and neutron components are superfluid. We study the overall spectral functions of protons, neutrons and electrons on the basis of the Coulomb and nuclear interactions. This study is performed in the framework of the Random Phase Approximation, generalized to superfluid systems. The formalism we use ensures that the Generalized Ward's Identities are satisfied. We focus on the coupling between neutrons and protons. On one hand this coupling results in collective modes that involve simultaneously neutrons and protons, on the other hand it produces a damping of the excitations. Both effects are especially visible in the spectral functions of the different components of the matter. At high density while the neutrons and protons tend to develop independent excitations, as indicated by the spectral functions, the neutron-proton coupling still produces a strong damping of the modes.

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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