arXiv 1409.28672014-09-30hep-phastro-ph.COastro-ph.HE

暗物质激发态的自散射

Self-Scattering for Dark Matter with an Excited State

Katelin Schutz, Tracy R. Slatyer

备注：: 27 pages + 19 pages appendices, 14 figures, Submitted to JCAP. v2 fixes typos, adds three references
DOI：: 10.1088/1475-7516/2015/01/021

摘要：

自相互作用的暗物质方案最近引起了人们的广泛关注，作为一种可能的手段，以减轻之间的紧张关系N体模拟和观测的暗物质分布在银河系和亚银河系尺度。暗物质内部结构的存在--例如，光谱中可能衰减的近简并态，或者碰撞激发或去激发--也被提出作为解决这些差异的可能方法。这种内部结构可以是直接和间接暗物质搜索中有趣的特征的来源，例如，为最近在星系和星系团中观察到的3.5 keV线提供了新的解释。我们分析了一个简单的模型，暗物质自散射，包括一个近简并激发态，并开发了一个精确的解析近似的弹性和非弹性的s-波截面，这是有效的微扰制度以外的粒子速度是足够低的（这个条件也需要的s-波占主导地位的更高的分波）。我们预计我们的结果将是有用的，在将非弹性自散射到N体模拟，以研究在星系结构和动力学的暗物质光谱中的近简并态的定量影响，并在计算多状态暗物质的间接签名。

英文摘要：

Self-interacting dark matter scenarios have recently attracted much attention, as a possible means to alleviate the tension between N-body simulations and observations of the dark matter distribution on galactic and sub-galactic scales. The presence of internal structure for the dark matter --- for example, a nearly-degenerate state in the spectrum that could decay, or be collisionally excited or de-excited --- has also been proposed as a possible means to address these discrepancies. Such internal structure can be a source of interesting signatures in direct and indirect dark matter searches, for example providing a novel explanation for the 3.5 keV line recently observed in galaxies and galaxy clusters. We analyze a simple model of dark matter self-scattering including a nearly-degenerate excited state, and develop an accurate analytic approximation for the elastic and inelastic s-wave cross sections, which is valid outside the perturbative regime provided the particle velocity is sufficiently low (this condition is also required for the s-wave to dominate over higher partial waves). We anticipate our results will be useful in incorporating inelastic self-scattering into N-body simulations, in order to study the quantitative impact of nearly-degenerate states in the dark matter spectrum on galactic structure and dynamics, and in computing the indirect signatures of multi-state dark matter.

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