The 12th International Workshop Dark Side of the Universe

Late Kinetic Decoupling from Dark Matter - Dark Radiation Scattering

27 Jul 2016, 11:30

15m

Egget auditorium in the UiB Student Center (University of Bergen)

Contributed talk Cosmological Probes of Dark Matter Cosmological Probes of Dark Matter

Speaker

Håvard Tveit Ihle (University of Oslo)

Summary

There is a growing interest in how the particle nature of dark matter (DM) can affect cosmological and
astrophysical observables. Kinetic decoupling of DM from the heat bath in the early universe, e.g., leads
to a pronounced cutoff in the matter power spectrum. Traditional WIMP models for DM (like SUSY) typically
result in MeV-scale kinetic decoupling, corresponding to a cutoff at unobservably small scales. Here, we
provide instead a classification of DM models that result in keV-scale kinetic decoupling. Such models result
in a potentially observable cutoff in the power spectrum, at the scale of dwarf-galaxies and hence possibly
addressing the missing satellite problem. The main focus of the talk will be on the decoupling process of DM
in the early universe, implications for model building, and some examples from our work.

Presentation materials

IHLE_Late_KDv3.pdf