Author

Indrajit Saha

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Preprint Sep 2026

Charged scalar portal dark matter with $U(1)_Y$ non-restoration and gravitational waves

We explore the possibility of reviving scalar singlet dark matter (DM) with a minimal extension by a charged singlet scalar which also leads to hypercharge non-restoration in the early Universe. The minimal scalar singlet DM annihilating via the Higgs portal is tightly constrained by direct-detection experiments, leavi...

D. Borah, Dhruv Ringe, Indrajit Saha · 2 citations · ⚡1

Preprint Aug 2026

Singlet-Doublet fermion origin of dark matter, neutrino mass and inverse first-order electroweak phase transition

We study the possibility of an inverse first-order electroweak phase transition (IFOEWPT) and observable gravitational waves (GW) in a radiative neutrino mass model of scotogenic type where singlet-doublet (SD) fermions, the lightest of whom is the dark matter (DM) candidate, generate the necessary seesaw at one-loop l...

D. Borah, Indrajit Saha, S. K. Sahoo et al. · 0 citations