WIMP isocurvature perturbation and small scale structure
Cosmology and Nongalactic Astrophysics
2015-11-25 v2 High Energy Physics - Phenomenology
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.
Keywords
Cite
@article{arxiv.1507.03871,
title = {WIMP isocurvature perturbation and small scale structure},
author = {Ki-Young Choi and Jinn-Ouk Gong and Chang Sub Shin},
journal= {arXiv preprint arXiv:1507.03871},
year = {2015}
}
Comments
6 pages, 3 figures, minor revisions, accepted for publication in PRL