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arXiv 2412.04585hep-phastro-ph.HEgr-qc
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两种相互作用流体紧凑星的热力学一致描述:中子星与Higgs通道暗物质的情况

Thermodynamic Consistent Description of Compact Stars of Two Interacting Fluids: The Case of Neutron Stars with Higgs Portal Dark Matter

University of Oklahoma(俄克拉荷马大学);Goethe Universität Frankfurt(法兰克福歌德大学);Institute of Space Sciences, Campus UAB(空间科学研究所(UAB校区));Institut d’Estudis Espacials de Catalunya(加泰罗尼亚空间研究学院);Frankfurt Institute for Advanced Studies(法兰克福高等研究院)

Fazlollah Hajkarim, Jürgen Schaffner-Bielich, Laura Tolos

AI总结:

本研究提出了一种热力学一致的方法,用于描述由两种相互作用流体(中子星物质和暗物质)组成的致密星,分析了暗物质质量对质量-半径关系和潮汐变形性的影响。

摘要:

我们考虑了一种热力学一致的方法,用于计算由两种相互作用流体组成的致密星的质量、半径和潮汐变形性。我们将这种相互作用流体方法首次应用于中子星物质的致密星情况,采用Higgs通道费米暗物质模型进行热力学一致的处理。质量-半径曲线和潮汐变形性的模式取决于暗物质粒子质量,并与以前的研究不同。与普通中子星性质相比,我们发现当暗物质粒子质量类似于核子质量时,质量和半径更小,因此由于暗物质的存在导致方程状态变软,潮汐变形性也更小。对于暗物质粒子质量低于核子质量且相对于暗物质粒子质量有显著化学势的情况,会出现暗晕而不是暗核。我们的研究为研究致密星的合并提供了基础,其中中子星物质和暗物质的两种流体相互耦合,由两个相互作用流体的单一能量动量张量描述,但化学性质不同,有各自独立保守的数流。

英文摘要:

We consider a thermodynamically consistent approach for the computation of the masses, radii, and tidal deformabilities of compact stars consisting of two interacting fluids with separately conserved quantum numbers. We apply this interacting fluid approach to the case of compact stars of neutron star matter with the Higgs portal fermionic dark matter model for the first time in a thermodynamically consistent manner. The patterns for the mass-radius curves and the tidal deformability depend on the dark matter particle mass and are different from former studies. Compared to ordinary neutron star properties, we obtain smaller masses and radii for dark matter particle masses similar to the nucleon mass and, hence, smaller tidal deformabilities as a result of the softening of the equation of state due to the presence of dark matter. For dark matter particle masses below the nucleon mass and sizable chemical potentials with respect to the dark matter particle mass, there will be a dark halo instead of dark core. Our investigation provides the basis for studying mergers of compact stars where the two fluids of neutron star matter and dark matter are coupled kinetically to each other and are described by one combined energy-momentum tensor of the two interacting fluids but are chemically different with two separately conserved number currents.

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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