Scalar multiplet dark matter in a fast expanding Universe: Resurrection of the desert region
Basabendu Barman, Purusottam Ghosh, Farinaldo S. Queiroz, Abhijit Kumar Saha
Abstract
We examine the impact of a faster expanding Universe on the phenomenology of scalar dark matter (DM) associated with $SU(2{)}_{L}$ multiplets. Earlier works with a radiation dominated Universe have reported the presence of desert region for both inert $SU(2{)}_{L}$ doublet and triplet DM candidates where the DM is underabundant. We find that the existence of a faster expanding component before big bang nucleosynthesis can revive a substantial part of the desert parameter space consistent with relic density requirements and other direct and indirect search bounds. We also review the possible collider search prospects of the newly obtained parameter space and predict that such region might be probed at the future colliders with improved sensitivity via a disappearing/stable charged track.