2019-01-09  P7F

Decaying particles at the MeV-scale: connection to dark matter, BBN and the CMB

Sebastian Wild

Dark sectors containing particles at the MeV-scale can induce distinctive observational signatures, such as (i) velocity-dependent self-interactions of dark matter which potentially solve shortcomings of the LambdaCDM model at small scales, (ii) non-standard recoil spectra at direct detection experiments, and (iii) non-trivial modifications of Big Bang Nucleosynthesis and the spectrum of the CMB. In this talk, we present an up-to-date analysis of the phenomenology of such scenarios from the point of view of particle physics, astrophysics and cosmology.