Constraining particle dark matter using local galaxy distribution
Constraining particle dark matter using local galaxy distribution
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DOI：
10.1088/1475-7516/2016/06/045
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发表时间：
2016-04
影响因子：
6.4
通讯作者：
S. Ando;Koji Ishiwata
中科院分区：
文献类型：
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作者：
S. Ando;Koji Ishiwata
长期以来，人们一直在讨论宇宙射线可能包含暗物质的信号。在过去的几年里，宇宙线正电子的异常引起了人们的广泛关注，最近AMS-02合作组报道了宇宙线反质子的过剩。这两种过度都可能表明暗物质的衰变或湮灭，质量约为1-10 TeV。在这篇文章中，我们研究的伽马射线从暗物质和交叉相关的星系分布的约束，特别是在本地体积。我们发现逆康普顿过程产生的伽马射线具有很大的强度，因此它们对TeV尺度质量体系中的暗物质场景给出了严格的约束。考虑到天体物理伽马射线源建模的最新进展以及暗物质衰变或湮灭的最终状态产物的综合可能性，我们表明，建议解释过量的衰变暗物质的参数区域被排除在外。我们还讨论了零化方案的约束条件。
It has been long discussed that cosmic rays may contain signals of dark matter. In the last couple of years an anomaly of cosmic-ray positrons has drawn a lot of attentions, and recently an excess in cosmic-ray anti-proton has been reported by AMS-02 collaboration. Both excesses may indicate towards decaying or annihilating dark matter with a mass of around 1–10 TeV . In this article we study the gamma rays from dark matter and constraints from cross correlations with distribution of galaxies, particularly in a local volume. We find that gamma rays due to inverse-Compton process have large intensity, and hence they give stringent constraints on dark matter scenarios in the TeV scale mass regime. Taking the recent developments in modeling astrophysical gamma-ray sources as well as comprehensive possibilities of the final state products of dark matter decay or annihilation into account, we show that the parameter regions of decaying dark matter that are suggested to explain the excesses are excluded. We also discuss the constrains on annihilating scenarios.