Dark Matter or Regular Matter in Neutron Stars? How to tell the difference from the coalescence of compact objects
Dark Matter or Regular Matter in Neutron Stars? How to tell the difference from the coalescence of compact objects
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DOI：
10.1103/physrevd.107.115028
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发表时间：
2022-11
期刊：
影响因子：
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通讯作者：
M. Hippert;Emily Dillingham;H. Tan;D. Curtin;J. Noronha-Hostler;N. Yunes
中科院分区：
文献类型：
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作者：
M. Hippert;Emily Dillingham;H. Tan;D. Curtin;J. Noronha-Hostler;N. Yunes
镜像孪生希格斯模型是（强相互作用）复杂暗物质的候选者，它反映了SM与较重夸克质量的相互作用。这种模型的结果是镜像中子星-完全由镜像物质组成的奇异恒星，它们比中子星小得多，电磁暗。这使得两颗镜像中子星的合并在引力波观测中可以被探测到并区分开来，但是我们能在观测上区分普通的中子星和那些可能含有镜像物质的中子星吗？这是我们在本文中研究的问题，集中在两种可能的实现镜像物质耦合到标准模型物质在一个紧凑的对象：（i）镜像物质捕获的中子星星和（ii）镜像中子星-中子星星合并。关于（i），我们发现（非旋转）镜像物质混合中子星不再具有单一的质量半径序列，而是存在于一个二维的质量半径平面中。关于（ii），我们发现，镜像中子星的双星系统将跨越更广泛的啁啾质量和完全不同的二元洛夫关系，允许合并残余物是非常轻的黑洞。这意味着先进的LIGO和Virgo的引力波观测以及NICER的X射线观测可以通过更广泛的模型和参数先验搜索来检测或限制镜像物质的存在。
The mirror twin Higgs model is a candidate for (strongly-interacting) complex dark matter, which mirrors SM interactions with heavier quark masses. A consequence of this model are mirror neutron stars -- exotic stars made entirely of mirror matter, which are significantly smaller than neutron stars and electromagnetically dark. This makes mergers of two mirror neutron stars detectable and distinguishable in gravitational wave observations, but can we observationally distinguish between regular neutron stars and those that may contain some mirror matter? This is the question we study in this paper, focusing on two possible realizations of mirror matter coupled to standard model matter within a compact object: (i) mirror matter captured by a neutron star and (ii) mirror neutron star-neutron star coalescences. Regarding (i), we find that (non-rotating) mirror-matter-admixed neutron stars no longer have a single mass-radius sequence, but rather exist in a two-dimensional mass-radius plane. Regarding (ii), we find that binary systems with mirror neutron stars would span a much wider range of chirp masses and completely different binary Love relations, allowing merger remnants to be very light black holes. The implications of this are that gravitational wave observations with advanced LIGO and Virgo, and X-ray observations with NICER, could detect or constrain the existence of mirror matter through searches with wider model and parameter priors.