Interacting hot dark matter

被引:22
作者
AtrioBarandela, F [1 ]
Davidson, S [1 ]
机构
[1] MAX PLANCK INST PHYS & ASTROPHYS, D-80805 MUNICH, GERMANY
关键词
D O I
10.1103/PhysRevD.55.5886
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We discuss the viability of a light particle (similar to 30 eV neutrino) with strong self-interactions as a dark matter candidate. The interaction prevents the neutrinos from free-streaming during the radiation-dominated regime so galaxy-sized density perturbations can survive. Smaller scale perturbations are damped due to neutrino diffusion. We calculate the power spectrum in the imperfect fluid approximation, and show that it is damped at the length scale one would estimate due to neutrino diffusion. The strength of the neutrino-neutrino coupling is only weakly constrained by observations, and could be chosen by fitting the power spectrum to the observed amplitude of matter density perturbations. The main shortcoming of our model is that interacting neutrinos cannot provide the dark matter in dwarf galaxies.
引用
收藏
页码:5886 / 5894
页数:9
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