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arXiv 2303.16630astro-ph.HE
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原中子星中的自发标量场化

Spontaneous Scalarization in Proto-neutron Stars

Fahimeh Rahimi, Zeinab Rezaei

AI总结:

本文基于标量-张量引力理论,采用手征西格玛模型和有限温度多体理论,研究原中子星在不同热物质状态下的自发标量场化,发现其受温度、熵及中微子俘获等条件显著影响。

摘要:

原中子星诞生于一颗高度演化的大质量恒星在引力作用下坍缩之时。本文研究了原中子星中的自发标量场化现象。基于标量-张量引力理论以及原中子星内部的物理条件,我们考察了原中子星的结构。为了描述原中子星内部的流体,我们采用了 $SU(2)$ 手征西格玛模型以及 Brueckner-Hartree-Fock 近似下 Brueckner-Bethe-Goldstone 量子多体理论的有限温度扩展。这里,我们应用了考虑不同情况的原中子星状态方程,即热纯中子物质和热 $\eta$-稳定中子星物质,分别考虑无中微子俘获以及有中微子俘获的情形。我们还研究了原中子星的温度和熵对星体结构的影响。我们的结果证实,自发标量场化受到原中子星中不同物理条件的影响。

英文摘要:

Proto-neutron stars are born when a highly evolved and massive star collapses under gravity. In this paper, we investigate the spontaneous scalarization in proto-neutron stars. Based on the scalar tensor theory of gravity as well as the physical conditions in proto-neutron star, we examine the structure of proto-neutron star. To describe the fluid in proto-neutron star, we utilize $SU(2)$ chiral sigma model and the finite temperature extension of the Brueckner-Bethe-Goldstone quantum many-body theory in the Brueckner-Hartree-Fock approximation. Here, we apply the equation of state of proto-neutron stars considering different cases i.e. hot pure neutron matter and hot $β$-stable neutron star matter without neutrino trapping as well as with neutrino trapping. The effects of temperature and entropy of proto-neutron stars on the star structure are also studied. Our results confirm that the spontaneous scalarization is affected by different physical conditions in proto-neutron stars.

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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