Speaker
Jacopo Ghiglieri
(SUBATECH, Nantes)
Description
In this talk I will consider a DM model with a new sector comprising of a Dark Matter fermion and a colored, heavier scalar, Yukawa-coupled to a Standard Model quark. In this model the DM fermion is produced both from freeze in and from the later decays of the frozen-out scalars. I will discuss how thermal effects such as the emergence of collectivity, of screening and of multiple interactions can be accounted for. I will show how they can significantly alter the standard expectation, namely that freeze-in production is dominated by temperatures of the order of the mass of the DM particle.
I will also discuss how the rate in the ultrarelativistic regime can be smoothly connected to the relativistic one
Author
Jacopo Ghiglieri
(SUBATECH, Nantes)