CANCELLED - IFIC Seminar: Stellar cooling limits on new scalars and extra dimensions

por Dr. Anton Sokolov (Oxford University)

martes 16 dic. 2025 12:00 → 13:30 Europe/Madrid

1001-Primera-1-1-1 - Paterna. Seminario (Universe)

Stellar evolution is known to serve as a sensitive probe of physics beyond the Standard model (BSM). Using a bottom-up effective field theory perspective, I will discuss the stellar cooling effects associated to Higgs-portal scalars and large extra dimensions, both of which arise naturally in the context of many BSM scenarios. Employing the formalism of thermal field theory to compute in-medium self-energies and mixing rates, we will see that scalars and KK gravitons with masses smaller than the plasma frequency in the stellar core can be efficiently produced by resonant mixing with in-medium electromagnetic excitations, and that this previously neglected effect gives the dominant robust contribution to supernova and/or red giant cooling. I will discuss the resulting constraints on new scalars and extra dimensions, together with the implications for future experiments and observations.