Speaker
CHRISTIANA vasilaki
(LPENS)
Description
The formation and decay of metastable dark matter bound states in the early universe can deplete the dark matter abundance, thereby affecting the predicted couplings and mass. The efficacy of the effect is suppressed by the ionisation and excitations of bound states due to the ambient radiation. While existing calculations take into account the thermal radiation, the dynamics of Hydrogen recombination suggests that the resonant radiation produced in capture processes may backreact, dissociating bound states and impeding the dark matter depletion. We investigate the backreaction of resonant radiation, as well as of higher-energy radiation produced by dark matter annihilation and bound-state decays in this context.
Authors
CHRISTIANA vasilaki
(LPENS)
Kallia Petraki
(ENS and Sorbonne University)