Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 11, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1475-7516/2016/11/043
Keywords
cosmological perturbation theory; dark matter theory; particle physics - cosmology connection; power spectrum
Funding
- European Union FP7 ITN INVISIBLES (Marie Curie Actions) [PaN-GA-2011-289/142]
- SPS KAKENHI [15K05084]
- MEXT KAKENHI [15H05888]
- JST CREST
- JSPS [25287050, 25610050]
- Grants-in-Aid for Scientific Research [26400241, 25610050, 15K05084, 25287050] Funding Source: KAKEN
- Direct For Mathematical & Physical Scien
- Division Of Physics [1316783] Funding Source: National Science Foundation
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Dark Matter (DM) models providing possible alternative solutions to the smallscale crisis of the standard cosmology are nowadays of growing interest. We consider DM interacting with light hidden fermions via well-motivated fundamental operators showing the resultant, matter power spectrum is suppressed on subgalactic scales within a plausible parameter region. Our basic description of the evolution of cosmological perturbations relies on a fully consistent first principles derivation of a perturbed Fokker-Planck type equation, generalizing existing literature. The cosmological perturbation of the Fokker-Planck equation is presented for the first time in two different gauges, where the results transform into each other according to the rules of gauge transformation. Furthermore, our focus lies on a, derivation of a broadly applicable and easily computable collision term showing important phenomenological differences to other existing approximations. As one of the Main results and concerning the small-scale crisis, we show the equal importance of vector and scalar boson mediated interactions between the DM and the light fermions.
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