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Light dark matter (DM) in the GeV ballpark faces weaker constraint fromdirect detection experiments. If such DM also has sufficient self-interactionsdue to a light mediator, it can alleviate the small-scale problems of the colddark matter (CDM) paradigm while being consistent with the latter at largescales, as suggested by astrophysical observations. However, generating correctthermal relic for such light DM is challenging. While GeV scale CDM typicallyleads to thermal overproduction due to the absence of sufficient annihilationchannels, self-interacting dark matter (SIDM) typically has under-abundantthermal relic due to its large annihilation rates into mediator particles. Inthis letter, we propose a minimal realisation of GeV scale SIDM with correctthermal relic, where one of the three singlet fermions, responsible for seesaworigin of light neutrino masses, assists in generating correct SIDM relicdensity via freeze-out. The setup thereby encompasses astrophysical as well ascosmological aspects of light DM while simultaneously providing a solution tothe origin of light neutrino mass. Due to such connection to several frontiers,there exist exciting discovery prospects in terms of direct and indirect searchof DM, laboratory and cosmology based dark photon signatures and effectivelight neutrino mass.

A new realisation of light thermal self-interacting dark matter and detection prospects