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arXiv 0902.1347astro-ph.HEastro-ph.COhep-exhep-ph
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太阳系中的暗物质II:WIMP在太阳中的湮灭率

Dark matter in the solar system II: WIMP annihilation rates in the Sun

Annika H. G. Peter

摘要:

我们计算了太阳中弱相互作用大质量粒子(WIMP)的湮灭率随其质量和弹性散射截面的变化。湮灭的副产品之一,μ子中微子,可能会被下一代中微子望远镜观测到。先前对湮灭率的估计假设来自银河系暗晕的任何WIMP被太阳核的弹性散射捕获,并在太阳中迅速达到热平衡。我们表明,太阳的光学深度WIMP和行星的引力都有助于降低湮灭率低于这些估计。虽然我们发现,即将到来的km^3级中微子望远镜对~100 GeV WIMP的灵敏度与之前的估计几乎没有变化,但这些实验对~10 TeV WIMP的灵敏度可能比标准计算所建议的要低一个数量级。湮灭率的新估计将指导未来的实验设计,并改善从中微子事件率到WIMP参数空间的映射。

英文摘要:

We calculate the annihilation rate of weakly interacting massive particles (WIMPs) in the Sun as a function of their mass and elastic scattering cross section. One byproduct of the annihilation, muon neutrinos, may be observed by the next generation of neutrino telescopes. Previous estimates of the annihilation rate assumed that any WIMPs from the Galactic dark halo that are captured in the Sun by elastic scattering off solar nuclei quickly reach thermal equilibrium in the Sun. We show that the optical depth of the Sun to WIMPs and the gravitational forces from planets both serve to decrease the annihilation rate below these estimates. While we find that the sensitivity of upcoming km^3-scale neutrino telescopes to ~100 GeV WIMPs is virtually unchanged from previous estimates, the sensitivity of these experiments to ~10 TeV WIMPs may be an order of magnitude less than the standard calculations would suggest. The new estimates of the annihilation rates should guide future experiment design and improve the mapping from neutrino event rates to WIMP parameter space.

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