1–5 Sept 2025
CERN
Europe/Zurich timezone

Limits of EFTs at finite temperature for strong phase transitions

2 Sept 2025, 15:50
5m
500/1-001 - Main Auditorium (CERN)

500/1-001 - Main Auditorium

CERN

400
Show room on map
Talk Cosmology

Speaker

Fabio Bernardo

Description

Phase transitions are violent and interesting phenomena that could have occurred in the early stages of the universe. Possible perturbative techniques to study these phenomena and predict their gravitational wave background can be used in the presence of a hierarchy of scales, leading to the construction of Effective Field Theories at finite temperature by integrating out the heavier scales. These EFTs are actually reliable when the dynamics are mainly encoded in the most relevant operators. I will then discuss the limits of such EFTs, showing how higher-dimensional operators affect the theoretical prediction of stronger transitions, including those detectable by LISA. These considerations impact the applicability of effective theory techniques, including their use in non-perturbative lattice studies.

Authors

Fabio Bernardo Philipp Klose Philipp Schicho Tuomas Tenkanen

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