Annihilating cold dark matter

被引:137
作者
Kaplinghat, M
Knox, L
Turner, MS
机构
[1] Univ Chicago, Dept Astron & Astrophys, Chicago, IL 60637 USA
[2] NASA, Fermi Natl Accelerator Lab, Fermilab Astrophys Ctr, Batavia, IL 60510 USA
[3] Univ Chicago, Enrico Fermi Inst, Dept Phys, Chicago, IL 60637 USA
关键词
D O I
10.1103/PhysRevLett.85.3335
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Structure formation with cold dark matter (CDM) predicts halos with a central density cusp, which are observationally disfavored. If CDM particles have an annihilation cross section sigma upsilon similar to 10(-29)(m/ GeV) cm(2), then annihilations will soften the cusps. We discuss plausible scenarios for avoiding the early Universe annihilation catastrophe that could result from such a large cross section. The predicted scaling of core density with halo mass depends upon the velocity dependence of sigma upsilon, and s-wave annihilation leads to a core density nearly independent of halo mass, which seems consistent with observations.
引用
收藏
页码:3335 / 3338
页数:4
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