Strong and Electro-Weak Matter 2026

Session

Quantum Fields in and out of Equilibrium Contributions 1

18 Aug 2026, 15:45

F4050 (4th floor) (University of Helsinki Main Building)

53. Towards a consistent approach to perturbation theory at finite temperature

Peter Lowdon

18/08/2026, 15:45

Quantum fields in and out of equilibrium and thermalisation

talk (15min)

The Gell-Mann-Low relation forms the foundation of all perturbative approaches to QFT. In order to establish how perturbation theory can be consistently generalised to finite-temperature systems it is therefore necessary to understand how this relation is modified by thermal effects. In this talk I will introduce a new proposal for how this relation should be generalised, based on the...