Halo-Shape and Relic-Density Exclusions of Sommerfeld-Enhanced Dark Matter Explanations of Cosmic Ray Excesses

被引：271

作者：

Feng, Jonathan L. ^{[1
]}

Kaplinghat, Manoj ^{[1
]}

Yu, Hai-Bo ^{[1
]}

机构：

[1] Univ Calif Irvine, Dept Phys & Astron, Irvine, CA 92697 USA

来源：

PHYSICAL REVIEW LETTERS | 2010年 / 104卷 / 15期

基金：

美国国家科学基金会;

关键词：

GALAXIES; ELECTRONS; ENERGIES; PROFILE;

D O I：

10.1103/PhysRevLett.104.151301

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Dark matter with Sommerfeld-enhanced annihilation has been proposed to explain observed cosmic ray positron excesses in the 10 GeV to TeV energy range. We show that the required enhancement implies thermal relic densities that are too small to be all of dark matter. We also show that the dark matter is sufficiently self-interacting that observations of elliptical galactic dark matter halos exclude large Sommerfeld enhancement for light force carriers. Resonant Sommerfeld enhancement does not modify these conclusions, and the astrophysical boosts required to resolve these discrepancies are disfavored, especially when significant self-interactions suppress halo substructure.

引用

页数：4

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