Seminar of the department “Theory of Fundamental Interactions”

Date and Time: Thursday, 29 June 2023, at 4:00 PM

Venue: Blokhintsev Hall (4th floor), Bogoliubov Laboratory of Theoretical Physics; online seminar on Zoom

Seminar topic: “Scale of new physics for the standard axion see-saw Higgs portal inflation model and the Higgs trilinear coupling”

Speaker: Chitta Ranjan Das

Abstract:

We carry out a phenomenological analysis of the effects in the extended scalar sector of the Standard Model axion see-saw Higgs portal inflation model framework. We address the one-loop correction to the triple Higgs coupling, λHHH, and solve the vacuum metastability problem in an appropriate region of the beyond-SM scalar parameter spaces. It is discovered that the threshold correction is inversely correlated with the λHHH and λH corrections for the SM Higgs quartic coupling. The general class of theories that apply threshold correction is constrained by a substantial λHHH correction (≳ 5%) that suggests vacuum instability in the model. The beyond-SM was subjected to a comprehensive two-loop renormalisation group analysis. Lepton asymmetry in the universe has also been estimated using the beyond-SM framework.