arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1609.01976nucl-thastro-ph.HE
收藏

中子星内壳的核-核相互作用

Nucleus--nucleus interactions in the inner crust of neutron stars

D. Kobyakov, C. J. Pethick

摘要:

中子星内壳核之间的相互作用包括两种贡献,即所谓的“直接”相互作用和由于中子流体密度变化引起的“诱导”相互作用。对于大的核间距$r$的贡献,从核力,这些条款显示为非零。在静态极限中,它们大小相等,但符号相反,并且完全抵消。根据这一发现,我们分析了早期的有效相互作用的结果。我们考虑了长波长集体模的性质,特别是计算了晶格声子和中子超流体中声子之间的混合程度。使用微观理论,我们计算的净非库仑贡献的核-核相互作用,并表明,对于大$r$,领先的长期是由于交换两个声子和变化为$1/r^7$:它是一个模拟的Casimir-Polder中性原子之间的相互作用。

英文摘要:

The interaction between nuclei in the inner crust of neutron stars consists of two contributions, the so-called "direct" interaction and an "induced" one due to density changes in the neutron fluid. For large nuclear separations $r$ the contributions from nuclear forces to each of these terms are shown to be nonzero. In the static limit they are equal in magnitude but have opposite signs and they cancel exactly. We analyze earlier results on effective interactions in the light of this finding. We consider the properties of long-wavelength collective modes and, in particular, calculate the degree of mixing between the lattice phonons and the phonons in the neutron superfluid. Using microscopic theory, we calculate the net non-Coulombic contribution to the nucleus--nucleus interaction and show that, for large $r$, the leading term is due to exchange of two phonons and varies as $1/r^7$: it is an analog of the Casimir--Polder interaction between neutral atoms.

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。

↑