Speaker: Alvaro Lozano-Onrubia (Universidas Autonoma de Madrid)
Title of Talk: Early Universe hypercharge breaking and neutrino mass generation
Abstract: Extensions of the Standard Model (SM) scalar sector featured in radiative neutrino mass models possess the ingredients for exotic thermal histories and rich possibilities for beyond SM physics. In this talk, we will explore the possibility of early Universe non-restoration of the $U_Y(1)$ gauge symmetry in the Zee-Babu neutrino mass generation model and the ways in which this phenomenology can be harnessed in mechanisms of baryo- and leptogenesis. We will find that subtleties in the treatment of finite-temperature perturbation theory play a decisive role in mapping out the parameter space of phenomenological interest. Moreover, we will re-encounter many of the pitfalls, lessons and open questions of past research on high-temperature inverse symmetry breaking and symmetry non-restoration. The highlight of the talk will be the outline of a novel baryon asymmetry generating mechanism which crucially relies on the high-temperature $U_Y(1)$ breaking phase and the exotic phenomenology of charge-breaking SM lepton masses therein.
Venue (HYBRID-EVENT): Goldene Box, Physikalisches Institut, INF 226, 69120 Heidelberg AND all talks will also be streamed via the permanent Zoom-link:
https://zoom.us/j/94602401603?pwd=SVRYMHQxaWJrUGtFWXRWdkFaKzJVUT09
Meeting ID: 946 0240 1603
Passcode: 386993
Schedule:
16:30 – 17:15 talk
17:15 – 17:30 discussion and questions
17:30 – 18:00 pizza & drinks
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The aim of the YRC Lunch Seminar is to promote individual research done by young researchers within Isoquant and create a regular platform to socialize and share ideas.