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arXiv 2104.06141hep-phastro-ph.COastro-ph.HEhep-thnucl-th
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弱相互作用暗扇区对中子星性质的影响及GW170817的约束

Implications of Feebly Interacting Dark Sector on Neutron Star Properties and Constraints from GW170817

Debashree Sen, Atanu Guha

摘要:

研究了静态条件下暗物质与强子物质的弱相互作用对中子星物态方程和结构性质的影响。为此,我们采用强子扇区的有效手征模型,并首次在NS内部可能存在DM的背景下,通过轻新物理介体引入DM-SM相互作用。此外,DM费米子的质量,介体和耦合是从子弹团的自相互作用约束和从今天的遗迹丰度。在所考虑的框架内,这项工作突出了基本硬化的EoS中存在的DM费米子的质量的顺序的几个GeV相比,没有DM的情况。因此,NS的最大引力质量与仅用强子物质EoS不能满足的最大质量粒子的边界一致。1.4 $M_{\odot}$ NS的半径和潮汐形变率以及与GW 170817相关的双星中子星(BNS)的潮汐形变率的估计值与GW 170817观测的BNS合并的单个约束值符合得很好。

英文摘要:

We investigate the effect of feeble interaction of dark matter (DM) with hadronic matter on the equation of state (EoS) and structural properties of neutron stars (NSs) in static conditions. For the purpose we adopt the effective chiral model for the hadronic sector and for the first time in the context of possible existence of DM inside NSs, we introduce DM-SM interaction through light new physics mediator. Moreover, the mass of DM fermion, the mediator and the coupling are adopted from the self-interaction constraint from Bullet cluster and from present day relic abundance. Within the considered framework, the work highlights the underlying stiffening of EoS in presence of DM fermion of mass of the order of a few GeV compared to the no-DM scenario. Consequently, the maximum gravitational mass of NS is obtained consistent with the bounds from the most massive pulsars which were not satisfied with the hadronic matter EoS alone. The estimates of radius and tidal deformability of 1.4 $M_{\odot}$ NS and the tidal deformabilities of the individual components of the binary neutron stars (BNS) associated with GW170817 are all in good agreement with the individual constraints obtained from GW170817 observation of BNS merger.

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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