Tev-scale thermal WIMPs: Unitarity and its consequences
Tev-scale thermal WIMPs: Unitarity and its consequences
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DOI：
10.1103/physrevd.100.043029
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发表时间：
2019-04
影响因子：
5
通讯作者：
J. Smirnov;J. Beacom
中科院分区：
文献类型：
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作者：
J. Smirnov;J. Beacom
我们重新研究的热WIMP暗物质的湮灭截面的么正性界限。对于高质量的点状暗物质，形成WIMP束缚态是普遍的，它与索末菲增强一起影响遗迹丰度。我们发现，这些效应降低了幺正性约束从139 TeV到低于100 TeV的非自共轭的暗物质和从195 TeV（经常引用的值340 TeV假设$\Omega_{DM} h ^2 = 1$）到140 TeV的自共轭的情况下。对于复合暗物质，其中的幺正性限制的半径被认为是质量无关的，我们表明，最大允许的质量是1 PeV。此外，我们发现了宇宙晚期湮灭的重要新效应。例如，虽然生产的高能轻费米子在WIMP湮灭被螺旋抑制，我们表明，束缚态的形成改变了这一点。再加上对TeV范围的伽马射线，宇宙射线和中微子的实验灵敏度的迅速提高，我们的研究结果为从高质量端攻击热WIMP质量范围提供了新的希望。
We re-examine unitarity bounds on the annihilation cross section of thermal-WIMP dark matter. For high-mass pointlike dark matter, it is generic to form WIMP bound states, which, together with Sommerfeld enhancement, affects the relic abundance. We show that these effects lower the unitarity bound from 139 TeV to below 100 TeV for non-self-conjugate dark matter and from 195 TeV (the oft-quoted value of 340 TeV assumes $\Omega_{DM} h^2 = 1$) to 140 TeV for the self-conjugate case. For composite dark matter, for which the unitarity limit on the radius was thought to be mass-independent, we show that the largest allowed mass is 1 PeV. In addition, we find important new effects for annihilation in the late universe. For example, while the production of high-energy light fermions in WIMP annihilation is suppressed by helicity, we show that bound-state formation changes this. Coupled with rapidly improving experimental sensitivity to TeV-range gamma rays, cosmic rays, and neutrinos, our results give new hope to attack the thermal-WIMP mass range from the high-mass end.