http://arxiv.org/abs/1507.03871
The adiabatic component of perturbations is damped during the kinetic decoupling due to the collision with relativistic component on sub-horizon scales. However the isocurvature part is free from the 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 matter 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 the small scale structure.
K. Choi, J. Gong and C. Shin
Wed, 15 Jul 15
56/65
Comments: 5 pages, 3 figures
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