arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2011.05855nucl-thastro-ph.HEnucl-ex
收藏

基于手征有效场论相互作用的有限温度中子物质

Neutron matter at finite temperature based on chiral effective field theory interactions

J. Keller, C. Wellenhofer, K. Hebeler, A. Schwenk

摘要:

本文从手征有效场论导出的二核子和三核子相互作用出发,研究了有限温度下中子物质的状态方程。自由能,压力,熵,和内能的计算使用多体微扰理论,包括自洽的Hartree-Fock解决方案的第三阶。我们包括三核子相互作用的贡献,而不采用正常的顺序近似,并提供理论的不确定性估计的基础上,在手征展开的顺序分析。我们的研究结果表明,热效应可以捕捉到非常好的通过热指数和密度依赖的有效质量。该框架为研究一般温度下的致密物质状态方程和与核心坍缩超新星和中子星合并相关的质子分数提供了基础。

英文摘要:

We study the equation of state of neutron matter at finite temperature based on two- and three-nucleon interactions derived within chiral effective field theory to next-to-next-to-next-to-leading order. The free energy, pressure, entropy, and internal energy are calculated using many-body perturbation theory including terms up to third order around the self-consistent Hartree-Fock solution. We include contributions from three-nucleon interactions without employing the normal-ordering approximation and provide theoretical uncertainty estimates based on an order-by-order analysis in the chiral expansion. Our results demonstrate that thermal effects can be captured remarkably well via a thermal index and a density-dependent effective mass. The presented framework provides the basis for studying the dense matter equation of state at general temperatures and proton fractions relevant for core-collapse supernovae and neutron star mergers.

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。

↑