| Speaker: | Philipp Schicho (University of Geneva) |
|---|---|
| Title: | Perturbative cosmological phase transitions and their bubble wall velocities |
| Date (JST): | Wed, Feb 26, 2025, 13:30 - 15:00 |
| Place: | Seminar Room A |
| Abstract: |
Scale hierarchies are required to reliably describe the thermodynamics of cosmological first-order phase transitions using perturbation theory. At finite temperature, such a hierarchy is provided naturally. One can then use this hierarchy to construct a three-dimensional effective field theory (EFT) that systematically includes thermal resummations to all orders. Using this EFT setup, I discuss completing the perturbative program for equilibrium thermodynamics of cosmological first-order phase transitions by determining the finite-temperature effective potential of gauge-Higgs theories at next-to-next-to-next-to-next-to-leading order (N4LO) [1]. To predict the phenomenological impact of these transitions, it is crucial to determine the expansion velocity of the bubbles they generate. For this purpose, I will introduce WallGo [2], a software package specifically designed to compute bubble wall velocities. [1] A. Ekstedt, P. Schicho, and T. V. I. Tenkanen, Cosmological phase transitions at three loops: The final verdict on perturbation theory, Phys. Rev. D 110, 096006 (2024), [2405.18349]. [2] A. Ekstedt, O. Gould, J. Hirvonen, B. Laurent, L. Niemi, P. Schicho, and J. van de Vis, How fast does the WallGo? A package for computing wall velocities in first-order phase transitions, (2024), [2411.04970]. |
