Astrophysical signatures of secluded dark matter

被引：453

作者：

Pospelov, Maxim ^{[1
,2
]}

Ritz, Adam ^{[1
]}

机构：

[1] Univ Victoria, Dept Phys & Astron, Victoria, BC V8P 5C2, Canada

[2] Perimeter Inst Theoret Phys, Waterloo, ON N2J 2W9, Canada

来源：

PHYSICS LETTERS B | 2009年 / 671卷 / 03期

基金：

加拿大自然科学与工程研究理事会;

关键词：

RAY POSITRON FRACTION; ANNIHILATIONS; ANTIPROTONS; LIMITS; LINE;

D O I：

10.1016/j.physletb.2008.12.012

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We analyze the indirect astrophysical signatures of secluded models of WIMP dark matter, characterized by a weak-scale rate for annihilation into light MeV-scale mediators which are metastable to decay into Standard Model states. Such scenarios allow a significant enhancement of the annihilation cross section in the galactic halo relative to its value at freeze-out, particularly when the mediator is light enough for this process to proceed through radiative capture to a metastable 'WIMP-onium' bound state. For MeV-scale vector mediators charged under a hidden U(1)' gauge group, the enhanced annihilation rate leads predominantly to a sizable excess positron flux. even in the absence of astrophysical boost factors. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：391 / 397

页数：7

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