Seminar on Seesaw Determination of Dark Matter Relic Density with Dr. Aritra Gupta

Join us for an illuminating seminar hosted by the Department of Physics, School of Natural Sciences, on Thursday, 9th May 2024, from 12 PM to 1 PM (IST) in room D-217. We are honored to welcome Dr. Aritra Gupta, a distinguished Postdoctoral Fellow from the Department of Theoretical Physics at Instituto de Física Corpuscular (IFIC), Valencia, Spain, as our esteemed speaker. Dr. Gupta will delve into the intriguing topic titled "Seesaw determination of the dark matter relic density." In this seminar, Dr. Gupta will present groundbreaking research demonstrating that within the conventional type-I seesaw framework, supplemented only by a neutrino portal interaction, the relic density of dark matter can be elucidated through a freeze-in mechanism. This elegant freeze-in scenario, where dark matter does not partake in a seesaw state, unfolds via gradual, seesaw-induced decays of Higgs W and Z bosons. Dr. Gupta will also explore two distinct scenarios, one of which postulates the presence of an observable neutrino line. Don't miss this exceptional opportunity to expand your understanding of the cosmos. We look forward to your participation.

Abstract:

We show that in the usual type-I seesaw framework, augmented solely by a neutrino portal interaction, the dark matter relic density can be created through freeze-in, in a manner fully determined by the seesaw interactions and the DM particle mass. This simple freeze-in scenario, where dark matter is not in a seesaw state, proceeds through slow, seesaw-induced decays of Higgs W and Z bosons. We identify two scenarios, one of which predicts the existence of an observable neutrino line.