Speaker
Description
We study a possible particle-antiparticle asymmetry in the dark matter (DM) sector via DM scatterings. We have studied two example scenarios in which we show a novel interplay between DM elastic and inelastic scatterings set the relic density and the composition of the DM sector in the present universe. The scenario can be realized in a $\mathcal{Z}_3$ symmetric effective theory with a complex scalar DM with cubic self-interaction which leads to CP-violation at one loop level.
In Ref.JHEP 08 (2020) 149 We have discussed the role of the semi-annihilation of DM producing the asymmetric relic. We find the upper bound on the DM mass for maximal CP-violation case to be 15 GeV, much stronger than the usual WIMP scenario.
In Ref.Phys.Rev.D 104 (2021) 12, 12 we have shown the role of DM self-scattering in deciding the density and composition of DM. In particular, the simultaneous presence of DM self-scatterings and annhilations are instrumental in generating the present density and possible particle-antiparticle asymmetry in the DM sector due to unitarity sum rules. This is realized again with a comlex scalar DM stabilized by reflection symmetry in a minimal theoretic framework.
| Session | Astroparticle Physics and Cosmology |
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