From vacuum decay to gravitational waves

Abstract

I present a recap of a fully analytical calculation of the Euclidean action for a self-interacting scalar field with a quartic potential, in the thin-wall approximation. I then apply this result to the coupled fluid-scalar field model, a phenomenologically relevant model for cosmological first order phase transitions, and compare results with numerical simulations from the literature.

Comments: Proceedings for 2nd Training School and General Meeting of the COST Action COSMIC WISPers (CA21106) (COSMICWISPers2024), 10-14 June 2024 and 3-6 September 2024, Ljubljana (Slovenia) and Istanbul (Turkey). Based on arXiv:2404.17632