Speaker
Description
Interaction between two dark matter (DM) components plays a crucial role in DM production, dynamics and phenomenology in multicomponent DM scenarios. We propose and study a new kind of DM, called pseudo-FIMP (pFIMP), which can be realised in a two-component DM setup. pFIMP is feebly connected to the visible sector but remains in thermal equilibrium by sufficient interaction with a thermal DM partner, before freezing out to achieve under abundance. Although it has no direct connection with the visible sector, pFIMP comes under the detector scanner via thermal DM loop. In this talk, we discuss the dynamics of pFIMP and its loop-induced detection possibilities in the presence of a thermal DM, when both are rendered stable under $\mathbb{Z}_2\otimes \mathbb{Z}_2^{\prime}$ symmetry. However, under a single discrete symmetry, a heavy dark sector particle `naturally’ becomes pFIMP when the lifetime is enhanced to that compared to the age of the universe, while the pFIMP partner component acts as thermal DM. This provides a rich phenomenology and larger available parameter space. We briefly discuss such possibility for $\mathbb{Z}_N$ symmetry, highlighting the cases of $\mathbb{Z}_2$ and $\mathbb{Z}_3$ symmetries specifically.
References: PhysRevD.108.L111702, PhysRevD.109.095031.
| Track type | Dark Matter |
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