FIMP dark matter mediated by a massive gauge boson around the phase transition period and the gravitational waves production

Abstract

We study the feebly-interacting massive particle dark matter whose production processes are significantly affected by the phase evolution and the complicated thermal corrections to the vector boson. We calculate the freeze-in processes to obtain the correct dark matter relic density by enumerating all the possible $1\ensuremath{\leftrightarrow}2$ and $2\ensuremath{\leftrightarrow}2$ processes. The predicted gravitational waves emitted by the first-order phase transitions and the cosmic strings are evaluated.

Topics & Concepts