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August 3, 20223:00 pm – 4:00 pm (CDT)

Symmetries Beyond the Standard Model: Cosmology and Non-Accelerator Signatures

Speaker:

Urjit A. Yajnik (Indian Institute of Technology, Bombay)

Host:

Doojin Kim

Location:

Address:

Mitchell Institute for Fundamental Physics & Astronomy

College Station, Texas 77843

Event Details

Neutrino physics presents a fascinating set of new phenomena yet hides some crucial evidence needed to relate these to other possibilities such as leptogenesis and lepton number violation. One generic feature of embedding the right chiral neutrino states in a gauge theory is the inevitable occurrence of Domain Walls in cosmology. The need for homogenous and isotropic cosmology implies that such walls can at best be transient. I discuss how mechanisms ensuring transience of such domain walls are constrained by the Big Bang Nucleosynthesis requirement. Secondly we obtain constraints on such models from relating leptogenesis and low energy electron Electric Dipole Moment data. I also present an alternative Left-Right-inclusive model where the domain walls do not occur but where we need several new particle species to account for observed cosmological and low energy physics.

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