Abstract
We propose a self-interacting dark matter (DM) scenario with a right handed neutrino (RHN) portal to the standard model (SM). The dark sector consists of a particle DM, assumed to be a Dirac fermion, and a light mediator in terms of a dark Abelian vector boson to give rise the required velocity-dependent self-interactions in agreement with astrophysical observations. Irrespective of thermal or nonthermal production of such a DM, its final relic remains underabundant due to efficient annihilation rates of DM into light mediators by virtue of large self-interaction coupling. We then show that a feeble portal of DM-SM interaction via a RHN offers a possibility to fill the relic deficit of DM via the late decay of a RHN. As RHNs also arise naturally in seesaw models explaining the origin of light neutrino masses, we outline two UV-complete realizations of the minimal setup in terms of scotogenic and gauged $B\ensuremath{-}L$ frameworks where connection to neutrino mass and other phenomenology like complementary discovery prospects are discussed.
Highlights
The presence of dark matter (DM), a nonluminous, nonbaryonic form of matter in the present Universe in large proportions, is supported by irrefutable evidence gathered in several astrophysics- and cosmology-based experiments over last few decades
We have studied a self-interacting dark matter scenario consistent with astrophysical requirements of addressing the small-scale issues of cold dark matter paradigm
To fill the relic deficit of self-interacting dark matter (SIDM), we propose a right handed neutrino portal SIDM scenario, which can have nontrivial connection to the origin of light neutrino masses depending upon the particular UV completion
Summary
The presence of dark matter (DM), a nonluminous, nonbaryonic form of matter in the present Universe in large proportions, is supported by irrefutable evidence gathered in several astrophysics- and cosmology-based experiments over last few decades. We consider a self-interacting dark matter scenario where one of the RHNs, introduced for the purpose of generating light neutrino masses, can play a nontrivial role in late-time nonthermal production of DM, filling the deficit caused due to strong DM annihilations into Z0. This gives rise to RHN portal SIDM scenario while the RHN is connected to light neutrino masses.
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