https://doi.org/10.1140/epjs/s11734-024-01121-6
Review
Mini-review on self-interacting dark matter
1
Department of Physics, North Lakhimpur University, Khelmati, 787031, Lakhimpur, Assam, India
2
Department of Physics and Institute of Basic Science, Sungkyunkwan University, 16419, Suwon, South Korea
Received:
29
August
2023
Accepted:
14
February
2024
Published online:
26
February
2024
In this mini-review, we explore an alternative paradigm to cold dark matter (CDM) postulated in 
model. The alternative known as the self-interacting dark matter (SIDM) addresses inconsistencies of predictions at small scales, the most prominent one being the cusp-core problem. We delve into the particle physics aspect of SIDM model building, focusing on SIDM via light mediators. However, light mediator models face challenges with thermal relic abundance due to efficient annihilation of SIDM and constraints from direct search, Big Bang Nucleosynthesis etc.. We then discuss two specific SIDM set-ups incorporating tiny neutrino masses. The first one involves a right-handed neutrino portal adjusting for relic deficit through its late decay. This portal connects the dark sector to neutrino mass and is realized in two UV complete ways—scotogenic and gauged 
. The second set-up features a singlet–doublet extended model, where doublet becomes long-lived, thanks to extremely small singlet–doublet mixing. The late decay of the doublet contributes non-thermally to the singlet SIDM relic. Adding a scalar doublet and two singlet fermions, which are odd under a 
symmetry, we also address eV-scale mass of neutrinos generated by a scotogenic set-up. In both scenarios, we explore the parameter space that leads to sufficient self-interaction and correct relic density. Our analysis incorporates all pertinent astrophysical, cosmological, experimental, and phenomenological constraints.
Manoranjan Dutta and Satyabrata Mahapatra contributed equally to this manuscript.
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