Speaker
Arunansu Sil
(Indian Institute of Technology Guwahati)
Description
We propose a low-scale leptogenesis scenario within the neutrino seesaw framework, where CP-violating decays of right-handed neutrinos (RHN) generate the required lepton asymmetry even for RHN masses below the Standard Model Higgs mass. This is achieved by delaying the sphaleron decoupling through a first-order electroweak phase transition, allowing efficient conversion of lepton asymmetry into the observed baryon asymmetry at temperatures below the conventional sphaleron freeze-out temperature. The framework is particularly relevant for cosmologies with low reheating temperatures and predicts observable gravitational wave signals from the phase transition, together with promising collider signatures from light right-handed neutrinos.
Authors
Arunansu Sil
(Indian Institute of Technology Guwahati)
Dipendu Bhandari
(IIT Guwahati)