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arXiv 2202.00702hep-phnucl-th
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掺有轻暗物质的中子星的冷却:个例研究

Cooling of Neutron Stars admixed with Light Dark Matter: a case study

M. Ángeles Pérez-García, H. Grigorian, C. Albertus, D. Barba, J. Silk

摘要:

中子星(NS)诞生时是热的,富含轻子的物体,根据标准范式通过随后的阶段演化,在这些阶段中,它们通过首先发射中微子和随后的光子来辐射多余的能量。目前基于标准模型计算的描述无法完全解释已报告的数十个物体的所有现有冷却数据系列。在这项工作中,我们考虑了一种有趣的可能性,即冷却的NS实际上可能与一部分光暗物质(LDM),$χ$混合。我们专注于一个特定的案例研究,假设一个通用的轻候选人与质量$m_χ=0.1$ $\rm GeV/c^2$,经历自湮灭反应,通过赝标介质产生中微子的最终状态。我们包括一个额外的功能,允许从LDM的热传导,而在黑暗的核心。通过模拟NS中的温度演化,我们发现LDM的存在可能会扭曲冷却模式,并根据其可观测性讨论这些结果。

英文摘要:

Neutron Stars (NSs) are born as hot, lepton-rich objects that evolve according to the standard paradigm through subsequent stages where they radiate the excess of energy by emitting, first, neutrinos and, later on, photons. Current descriptions based on Standard Model calculations cannot fully explain all the existing cooling data series for the dozens of objects that have been reported. In this work, we consider the intriguing possibility that cooling NSs could be actually admixed with a fraction of light dark matter (LDM), $χ$. We focus on a particular case study assuming a generic light candidate with mass $m_χ=0.1$ $\rm GeV/c^2$ that undergoes self-annihilating reactions through pseudoscalar mediators producing neutrinos in the final state. We include one additional feature, allowing thermal conduction from LDM while inside the dark core. By performing simulations of the temperature evolution in the NS, we find that cooling patterns could be distorted by the presence of LDM and discuss these results in light of their observability.

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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