The Impact of Halo Substructure on Dark Matter Signatures

被引：0
|
作者：
Lattanzi, Massimiliano [1 ,2 ]
Silk, Joseph [3 ]
机构：
[1] Univ Roma La Sapienza, ICRA, I-00183 Rome, Italy
[2] Univ Roma La Sapienza, Dip Fis, I-00183 Rome, Italy
[3] Univ Oxford, Dept Phys, Oxford OX1 3RH, England
来源：
NUCLEAR PHYSICS B-PROCEEDINGS SUPPLEMENTS | 2009年 / 194卷
关键词：
COSMIC-RAYS; ENERGIES;
D O I：
10.1016/j.nuclphysbps.2009.07.096
中图分类号：
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号：
摘要：
PAMELA/FERMI/HESS data on positrons may be explained in terms of solar neighbourhood WIMP annihilations primarily to leptons or muons for a few TeV mass WIMP with a Sommerfeld-corrected boost similar to 10(4) - 10(5), provided that a small component of the dark matter is in cold subhalo substructure. Saturation of the Sommerfeld effect constrains the range of contributing substructures to be above similar to 10(5) M-circle dot. Dynamical friction and tidal disruption of substructure in the inner regions of halos and subhalos play an important role in suppressing annihilations. The associated diffuse gamma ray or synchrotron signal from the inner galaxy is below current limits, but an inverse Compton contribution produced in early universe substructure annihilations is potentially detectable by FERMI as an isotropic background.
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收藏
页码：162 / 165
页数：4
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