Effective Theories for Nonperturbative Physics 2026

Contribution List

1. Welcome and Icebreakers

24/08/2026, 10:00

2. Talk (30'+15')

Seth Koren (Notre Dame U.)

24/08/2026, 11:15

3. Talk (45'+15')

Roman Zwicky (U. Edinburgh)

24/08/2026, 14:00

4. Talk (30'+15')

Pablo Sesma (IFAE Barcelona)

25/08/2026, 10:00

5. Towards the exotic infrared phases of chiral gauge theories (30'+15')

Alvaro Pastor Gutierrez

25/08/2026, 11:15

The infrared structure of gauge theories with chiral fermions remains largely unexplored. In this talk I will discuss the Bars-Yankielowicz class using the functional renormalisation group, building on recent developments in gauge-fermion systems that provide clear criteria for confinement and dynamical symmetry breaking. I will show how two distinct phases arise: one exhibiting both...

6. Talk (45'+15')

Alberto Mariotti (Vrije Universiteit Brussel)

25/08/2026, 14:00

7. Extracting zero-damped modes using exact WKB (30'+15')

Nils Wagner (TU Munich)

26/08/2026, 10:00

Zero-damped quasinormal modes are a characteristic feature of near-extremal black holes and are expected to play an important role in their late-time ringdown. In this talk, I will give a pedagogical introduction to the exact WKB method and show how it can be used to study the zero-damped spectrum of near-extremal Reissner--Nordström black holes, highlighting recent developments that make this...

8. Effective field theories for phase transitions (30'+15')

Oliver Gould (Nottingham U.)

26/08/2026, 11:15

9. Talk (45'+15')

Litim Daniel

26/08/2026, 14:00

10. Dynamics of nucleation in first-order phase transitions (30'+15')

Andrey Shkerin (Perimeter Institute)

27/08/2026, 10:00

I will discuss dynamical effects during bubble nucleation in thermal first-order phase transitions. These effects arise due to lack of local thermal equilibrium and affect the parameters of the transition including the nucleation rate. I will present a general method of calculating the dynamical nucleation rate. I will also present results from real-time classical lattice simulations showing...

11. Thermal nucleation in perturbation theory (30'+15')

Joonas Hirvonen (Nottingham U.)

27/08/2026, 11:15

Cosmological first-order phase transitions may have generated a gravitational wave background detectable by LISA, offering a unique window into physics beyond the Standard Model. A crucial step in predicting this background is the reliable computation of bubble nucleation rates. In this talk, we overview the current state of perturbative calculations based on effective field theories and...

12. Talk (45'+15')

Joerg Jaeckel (Heidelberg U.)

27/08/2026, 14:00

13. Talk (30'+15')

Daniel Brennan (Birmingham U.)

28/08/2026, 10:00

14. Talk (30'+15')

28/08/2026, 11:15

15. Real-time tunneling calculations in the steadyon picture (30'+15')

Thomas Steingasser (IFT/CSIC, UAM)

31/08/2026, 10:00

Quantum tunnelling is conventionally formulated through Euclidean instantons, obscuring the role of physical time and complicating non-vacuum initial states. I will review the steadyon picture, in which infinitesimally regulated real-time path integrals are controlled by complex saddles whose projections recover familiar instantons. I will summarize its applications to finite-temperature...

16. Dynamical evolution of the pressure on the bubble wall (30'+15')

Benoit Laurent (Perimeter Institute)

31/08/2026, 11:15

First-order cosmological phase transitions proceed through the nucleation and growth of bubbles of the new phase, and can be a leading source of gravitational waves, baryogenesis, and dark matter in the early Universe. A central question is what happens to a bubble immediately after it nucleates: does the wall settle into a slow, subsonic regime, or does it accelerate to ultra-relativistic...

17. Talk (45'+15')

Markus Luty (UC Davis)

31/08/2026, 14:00

18. Renormalisable four-fermion interactions in four dimensions (30'+15')

Charlie Cresswell-Hogg

01/09/2026, 10:00

Four-fermion interactions are important in many areas of particle physics, from effective descriptions of weak interactions and QCD to parametrisations of new physics in frameworks such as SMEFT. In this talk I demonstrate that four-fermion interactions may develop strongly coupled UV fixed points in four dimensional QFTs, becoming non-perturbatively renormalisable, and UV completing...

19. Talk (30'+15')

Martin Münzenberg (JGU Mainz)

01/09/2026, 11:15

20. Talk (45'+15')

Mia West (KIT)

01/09/2026, 14:00

21. Talk (30'+15')

Steven Abel

02/09/2026, 10:00

22. Talk (30'+15')

Miguel Vanvlasselaer (U. Barcelona)

02/09/2026, 11:15

23. Talk (45'+15')

Joan Elias Miro (ICTP Trieste)

02/09/2026, 14:00

24. Effective methods for bubble nucleation in cosmological phase transitions (30'+15')

Maciej Kierkla

03/09/2026, 10:00

I will present an overview of the calculation of the thermal bubble nucleation rate in the context of cosmological phase transitions (PT). Focusing on the case of “SU(2)+Higgs” like theories, I will illustrate the calculation of the nucleation rate in the framework of high-temperature dimensional reduction. I will present next-to-leading order results and discuss the limitations of employing...

25. Talk (30'+15')

Yan Luo (DESY and USTC, Hefei)

03/09/2026, 11:15

26. Talk (45'+15')

Mohamed Anber (Durham)

03/09/2026, 14:00

27. Talk (30'+15')

04/09/2026, 10:00

28. Talk (30'+15')

04/09/2026, 11:15