Kaplinghat M, Knox L, Turner MS
Department of Astronomy and Astrophysics, The University of Chicago, 5640 S. Ellis Avenue, Chicago, Illinois 60637, USA.
Phys Rev Lett. 2000 Oct 16;85(16):3335-8. doi: 10.1103/PhysRevLett.85.3335.
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 sigmav approximately 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 sigmav, and s-wave annihilation leads to a core density nearly independent of halo mass, which seems consistent with observations.
冷暗物质（CDM）的结构形成预测晕中心存在密度尖点，但这与观测结果不符。如果CDM粒子的湮灭截面σv约为10^(-29)(m/GeV) cm²，那么湮灭将使尖点变软。我们讨论了避免因如此大的截面可能导致的早期宇宙湮灭灾难的合理情景。预测的核心密度随晕质量的标度取决于σv的速度依赖性，s波湮灭导致核心密度几乎与晕质量无关，这似乎与观测结果一致。
