WIMP isocurvature perturbation and small scale structure
arXiv:1507.03871 · doi:10.1103/PhysRevLett.115.211302
Abstract
The adiabatic perturbation of dark matter is damped during the kinetic decoupling due to the collision with relativistic component on sub-horizon scales. However the isocurvature part is free from damping and could be large enough to make a substantial contribution to the formation of small scale structure. We explicitly study the weakly interacting massive particles as dark matter with an early mater dominated period before radiation domination and show that the isocurvature perturbation is generated during the phase transition and leaves imprint in the observable signatures for small scale structure.
6 pages, 3 figures, minor revisions, accepted for publication in PRL
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- A new bound on the low reheating temperature with dark matter
- Reconstruction of potentials of the hybrid inflation in the light of primordial black hole formation
- A map of the non-thermal WIMP
- Dark matter cooling during early matter-domination boosts sub-earth halos