Non-thermal production of Dark Matter in an EFT scenario

by Ananya Tapadar (IFJ PAN)

Thursday 20 Mar 2025, 14:00 → 15:00 Europe/Warsaw

Here we aim to unveil a scenario with a non-minimal secluded dark sector in an effective field theory (EFT) framework. To explore this, we have examined a suitable extension of the type-X Two Higgs Doublet Model (2HDM) as a potential origin for the secluded DS. The DS comprises a DM candidate and a portal particle ‘a’. It becomes non-thermally populated through diverse dim-6 four-Fermi operators, effectively generated by integrating out the heavier Higgs particles which serve as the mediators between the two sectors. The analysis further focuses on the consequences of the collision processes DM + a ↔ a + a and DM + DM ↔ a + a occurring within the DS. We have investigated the significance of employing an EFT approach in tracking the temperature evolution of the DS. Within the present framework, the observed relic abundance of the DM can be realized through both dark freeze-out and freeze-in mechanisms. Further, we have delineated the permissible ranges of the relevant parameters, viz., the DM mass (m χ ≳ 20 GeV), the portal coupling (C τ ≲ 10 −14 GeV −2 ), and the DS coupling (λ ≲ 10 −6 GeV −2 ) by taking into account the perturbativity of the involved couplings while reproducing the observed DM relic and complying with the bounds from a successful Big Bang Nucleosynthesis (BBN) and γ-ray searches.

20250320_Tapadar_Ananya.pdf