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arXiv 1808.04746astro-ph.HEgr-qchep-ph
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从多信使天文学看中子星-轴子星碰撞

Neutron star -- axion star collisions in the light of multi-messenger astronomy

Tim Dietrich, Francesca Day, Katy Clough, Michael Coughlin, Jens Niemeyer

摘要:

由于轴子满足冷暗物质的观测要求,并且在理论上有很好的动机,因此它越来越被看好作为星系中暗物质的候选粒子。轴子场的波动会产生稳定的局部超密度,称为轴子星,对于最大质量、最紧凑的情况,它们是潜在的中子星模仿者。原则上,没有基本的论据反对GW 170817/GRB 170817 A/AT 2017 gfo的多信使观测结果来自一颗中子星与一颗中子星模仿者的合并,而不是来自一颗双星中子星。为了限制这种可能性并更好地理解中子星-轴子星(NSAS)合并的天体物理特征,我们在这项工作中提出了一个基于全三维数值相对论模拟的NSAS合并的详细例子,并概述了许多潜在的可观测量-从引力波,光学和近红外电磁信号,无线电耀斑,快速射电暴,伽马射线暴和中微子发射。我们讨论了各个通道,并估计距离当前和未来的天文台可能能够检测到这样的NSAS合并。这样的信号可以限制未知的轴子质量及其与标准重子物质的耦合,从而增强我们对宇宙暗物质部分的理解。

英文摘要:

Axions are increasingly favoured as a candidate particle for the dark matter in galaxies, since they satisfy the observational requirements for cold dark matter and are theoretically well motivated. Fluctuations in the axion field give rise to stable localised overdensities known as axion stars, which, for the most massive, compact cases, are potential neutron star mimickers. In principle, there are no fundamental arguments against the multi-messenger observations of GW170817/GRB170817A/AT2017gfo arising from the merger of a neutron star with a neutron star mimicker, rather than from a binary neutron star. To constrain this possibility and better understand the astrophysical signatures of a neutron star--axion star (NSAS) merger, we present in this work a detailed example case of a NSAS merger based on full 3D numerical relativity simulations, and give an overview of the many potential observables - ranging from gravitational waves, to optical and near-infrared electromagnetic signals, radio flares, fast radio bursts, gamma ray bursts, and neutrino emission. We discuss the individual channels and estimate to which distances current and future observatories might be able to detect such a NSAS merger. Such signals could constrain the unknown axion mass and its couplings to standard baryonic matter,thus enhancing our understanding of the dark matter sector of the Universe.

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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