超重暗物质在超致密团块中的湮灭
Annihilations of superheavy dark matter in superdense clumps
摘要：
超重暗物质（SHDM）与环境交换能量的速度比质量接近电弱（EW）尺度的粒子慢得多，因此具有不同的小尺度成团特性。使用中性伴子作为候选的SHDM，我们发现，自由流允许形成DM块的所有质量下降到$\sim 260 m_χ$的情况下，比诺。如果小规模的团块从一个非标准的，尖峰频谱的扰动，DM团块可能会形成在辐射主导的时代。这些团块不会被潮汐相互作用破坏，并且可以非常密集。在双星的情况下，“重力热灾难”可以在最密集的团块的中心部分发展，进一步增加中心密度，从而增加湮灭信号。在希格西诺的情况下，湮灭信号被索末菲效应增强。因此，超重中性伴子在致密团块中的湮灭可能导致可观测到的湮灭产物通量，其形式为高能粒子，对于这两种情况，希格斯玻色子和双星，都是最轻的超对称粒子。
英文摘要：
Superheavy dark matter (SHDM) exchanges energy with its environment much slower than particles with masses close to the electroweak (EW) scale and has therefore different small-scale clustering properties. Using the neutralino as candidate for the SHDM, we find that free-streaming allows the formation of DM clumps of all masses down to $\sim 260 m_χ$ in the case of bino. If small-scale clumps evolve from a non-standard, spiky spectrum of perturbations, DM clumps may form during the radiation dominated era. These clumps are not destroyed by tidal interactions and can be extremely dense. In the case of a bino, a "gravithermal catastrophe" can develop in the central part of the most dense clumps, increasing further the central density and thus the annihilation signal. In the case of a higgsino, the annihilation signal is enhanced by the Sommerfeld effect. As a result annihilations of superheavy neutralinos in dense clumps may lead to observable fluxes of annihilation products in the form of ultrahigh energy particles, for both cases, higgsinos and binos, as lightest supersymmetric particles.
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。
