# Cosmological phase transitions without high-temperature expansions

- Institution: CERN
- Department: TH institutes
- Speaker: Pablo Navarrete
- Year: 2025
- Language: English
- Source: [CERN](https://videos.cern.ch/record/3021120)
- Licence: [CERN](http://copyright.web.cern.ch)
- Who can watch: Teens profiles and older (sources give no ratings; placed by Invisible Network from the source's own words)

Accurate determination of equilibrium thermal parameters in strong first-order phase transitions — in particular, the critical temperature and latent heat — is essential for predicting gravitational-wave signals detectable by upcoming spaceborne observatories.

In perturbation theory, the evaluation of the thermal effective potential for such strong transitions is hampered by the presence of large masses in the Higgs phase. This prompts the question of how to properly resum the soft sector while accounting for heavy masses, and calls for new ways to tackle the computation of fully massive thermal sum-integrals at the multiloop level.

In this talk, we put forward a perturbative framework for computing the full four-dimensional effective potential across all mass regimes. The key advance is a unified treatment of both hard and soft scales within a single expression, enabling consistent numerical evaluation of fully massive sum-integrals to three loops and beyond via the so-called hot Loop–Tree Duality. This approach may yield accurate predictions in beyond-the-Standard-Model scenarios featuring strong transitions that are relevant for gravitational-wave observatories..

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## Lectures

1. [Cosmological phase transitions without high-temperature expansions](https://invisiblenetwork.ai/learn/cern/3021120/a7492e05efa0), 44 min (CERN's player)