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Effective Theories for Nonperturbative Physics 2026

24 August 2026 to 4 September 2026
IPPP, Durham University
Europe/London timezone

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Contribution List

34 out of 34 displayed
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  1. 1. Welcome and Icebreakers
    24/08/2026, 10:00
  2. 2. Generalized symmetries and non-invertible naturalness (30'+15')
    Seth Koren (Notre Dame U.)
    24/08/2026, 11:15
  3. 3. Talk (45'+15')
    Roman Zwicky (U. Edinburgh)
    24/08/2026, 14:00
  4. 4. Talk (30'+15')
    Pablo Sesma (IFAE Barcelona)
    25/08/2026, 10:00
  5. 19. Daisy Resummation Beyond Leading Order (30'+15')
    Martin Münzenberg (JGU Mainz)
    25/08/2026, 11:15
  6. 6. Metastable defects and gravitational waves (45'+15')
    Alberto Mariotti (Vrije Universiteit Brussel)
    25/08/2026, 14:00
  7. 18. Renormalisable four-fermion interactions in four dimensions (30'+15')
    Charlie Cresswell-Hogg
    26/08/2026, 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...

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  8. 22. Non-adiabatic sphaleron biasing and Baryogenesis (30'+15')
    Miguel Vanvlasselaer (U. Barcelona)
    26/08/2026, 11:15
  9. 9. Renormalizing the Nonrenormalizable in Perturbation Theory (45'+15')
    Litim Daniel
    26/08/2026, 14:00
  10. 24. Effective methods for bubble nucleation in cosmological phase transitions (30'+15')
    Maciej Kierkla
    26/08/2026, 15:30

    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...

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  11. 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...

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  12. 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...

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  13. 12. Some thoughts on field redefinitions and/or low energy potentials (45'+15')
    Joerg Jaeckel (Heidelberg U.)
    27/08/2026, 14:00
  14. 5. Towards the exotic infrared phases of chiral gauge theories (30'+15')
    Alvaro Pastor Gutierrez
    27/08/2026, 15:30

    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...

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  15. 13. Higher Charge Monopoles and GUT Physics (30'+15')
    Daniel Brennan (Birmingham U.)
    28/08/2026, 10:00
  16. 14. Supercooling in confining theories (30'+15')
    Gaurang Ramakant Kane
    28/08/2026, 11:15
  17. 34. Week 2 Icebreakers
    31/08/2026, 09:45
  18. 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...

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  19. 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...

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  20. 17. Chiral Gauge Theory on a Computer (45'+15')
    Markus Luty (UC Davis)
    31/08/2026, 14:00
  21. 7. Extracting zero-damped modes using exact WKB (30'+15')
    Nils Wagner (TU Munich)
    01/09/2026, 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...

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  22. 32. Another Brick in the Wall: Domain Wall Networks Beyond Z₂ (30'+15')
    Dhruv Pasari (Durham University)
    01/09/2026, 11:15

    Domain walls beyond the textbook Z₂ kink have been studied analytically and through effective models, but seldom simulated directly on the lattice. We close that gap, evolving Z₃ and Z₄ wall networks with CosmoLattice. These networks are qualitatively richer than Z₂: walls come in distinct species, meet along junctions, and can transmute into one another rather than simply annihilating. To...

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  23. 20. Bounding a dark sector ChiPT Lagrangian with unitarity (45'+15')
    Mia West (KIT)
    01/09/2026, 14:00
  24. 33. Theoretical uncertainties in (H)EFT: Equations of Motion vs. Field Redefinitions (30'+15')
    Shakeel Ur Rahaman (IPPP Durham)
    01/09/2026, 15:30

    Effective field theories rely on truncated expansions whose interpretation is intertwined with redundancies from field redefinitions. This interplay raises important questions about power counting and the consistent assignment of theoretical uncertainties associated with neglected higher-dimensional operators. In this talk, I use field redefinition invariance as a tool to assess truncation...

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  25. 21. UV/IR Mixing Through the Lens of Tensor Networks (30'+15')
    Steven Abel
    02/09/2026, 10:00
  26. 8. Effective field theories for phase transitions (30'+15')
    Oliver Gould (Nottingham U.)
    02/09/2026, 11:15
  27. 23. Talk (45'+15')
    Joan Elias Miro (ICTP Trieste)
    02/09/2026, 14:00
  28. 29. Sphaleron Transitions in Real Time
    Pedro Bittar (Perimeter Institute)
    03/09/2026, 10:00
  29. 25. Excited-Vacuum Decay from Large-Order Perturbation Theory (30'+15')
    Yan Luo (DESY and USTC, Hefei)
    03/09/2026, 11:15
  30. 26. Non-perturbative QFT on the twisted four-torus (45'+15')
    Mohamed Anber (Durham)
    03/09/2026, 14:00

    I will review the old 't Hooft construction of fractional instantons on the twisted four-torus and its relation to the modern language of 1-form symmetry. Then, I will describe how this setup enables us to perform nonperturbative calculations in QFT. In particular, I will discuss how to compute the gaugino condensates in supersymmetric theories on the four-torus.

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  31. 27. The fermion sign problem in Gauss law sectors of quantum link models with dynamical matter (30'+15')
    Pallabi Dey (Saha Institute of Nuclear Physics, Kolkata, India)
    04/09/2026, 10:00
  32. 31. Nonlocal Effective Field Theory Approach to Thermal Photon Condensation in a Strongly Magnetized Vacuum (30'+15')
    Selym Villalba-Chavez (HHU Düsseldorf)
    04/09/2026, 11:15
  33. 28. Infrared divergence cancellation, monopole-fermion scattering, x-ray edge spectra, and open quantum system (30'+15')
    Soo-Jong Rey (Kwangwoon University)
  34. 30. SU(N) Confining Bubbles at Large N: Finite Theta effects and strongly coupled plasma hydrodynamics (30'+15')
    Nicklas Ramberg (SISSA)