Speaker
Maxim Laletin
(N)
Description
We study a novel dark matter production mechanism based on the freeze-in through semi-production, i.e. the inverse semi-annihilation processes. A peculiar feature of this scenario is that the production rate is suppressed by a small initial abundance of dark matter and consequently creating the observed abundance requires much larger coupling values than for the usual freeze-in. We provide a concrete example model exhibiting such production mechanism and study it in detail, extending the standard formalism to include the evolution of dark matter temperature alongside its number density and discuss the importance of this improved treatment. We show that, even if it was never in full thermal equilibrium in the early Universe, dark matter could, nevertheless, have strong enough present-day annihilation cross section to lead to observable signals, such as the Galactic Center gamma-ray excess.
| Please choose the session this abstract belongs to | Dark matter |
|---|
Primary author
Maxim Laletin
(N)
Co-author
Dr
Andrzej Hryczuk
(NCBJ)
