Cosmological phase transition: Robust thermal resummation
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Title: Cosmological phase transition: Robust thermal resummation
Speaker: Dr Philipp Schicho (University of Helsinki)
Abstract:
Thermal field theories exhibit a rigorous scale hierarchy and their bosonic sector is rendered non-perturbative in the infrared. Hence, to reliably describe the thermodynamics of the electroweak phase transition both perturbative and non-perturbative methods are needed. At the intersection between these methods, one can construct a 3-dimensional effective theory that has thermal resummations systematically built in to all orders.
I apply computer algebraic multi-loop tools of perturbation theory for finite-temperature theories to determine this dimensionally reduced theory. Therefrom, I demonstrate how to calculate the effective potential to describe cosmological first-order phase transitions in Beyond the Standard Model theories with extended Higgs sectors. The theoretical uncertainties for such transitions are contrasted with other approaches to resummation.
