Effective Theories for Nonperturbative Physics

Session

Talks

Aug 5, 2024, 10:00 AM

2413/2-430 - MITP Seminar Room (MITP - Mainz Institute for Theoretical Physics, Johannes Gutenberg University Mainz)

1. Ling-Xiao Xu - Proving chiral symmetry breaking in QCD with ’t Hooft anomaly matching

8/5/24, 10:00 AM

Chiral symmetry breaking in the confining phase of QCD is a well-established phenomenon, yet it has been a challenge to derive this phenomenon from the theoretical viewpoint. In the seminal 1979 Cargese lectures, ’t Hooft showed how to use anomaly matching to prove chiral symmetry breaking, he showed some but didn’t give the general proof. In this talk, I will present a new strategy which can...

2. Álvaro Pastor Gutiérrez - Cartography of gauge-fermion dynamics: Confinement, Chiral Symmetry Breaking and Conformality

8/5/24, 11:30 AM

We study the interplay between colour-confining and chiral symmetry-breaking dynamics in gauge-fermion theories. We target the challenging many-flavour limit of theory space using the non-perturbative functional Renormalisation Group approach. This work connects the QCD-like regime, in quantitative agreement with Lattice data, with the perturbative conformal limit of theory space. Utilising...

3. Andrew Gomes - The phases of gauge theories from AMSB

8/6/24, 10:00 AM

Recently it has been demonstrated that anomaly-mediated supersymmetry breaking (AMSB) is a valuable tool for understanding the low-energy phases of non-SUSY gauge theories. For example, applying AMSB to SUSY SU(N) gauge theories with quarks in the fundamental leads to scalar potentials with chiral symmetry breaking minima. Furthermore, the application of AMSB to a class of SUSY SO(N) gauge...

6. Prisco Lo Chiatto - Following Quantum Imprints in the Realm of Large Multiplicity

8/6/24, 11:30 AM

5. Rachel Houtz - Hamiltonian Truncation Effective Theory

8/7/24, 10:00 AM

Hamiltonian truncation is a non-perturbative numerical method for calculating observables of a quantum field theory. In this talk, I will show how to treat Hamiltonian truncation systematically using effective field theory methodology. The starting point for this method is to truncate the interacting Hamiltonian to a finite-dimensional space of states below some energy cutoff Emax. The...

11. Werner Porod - Using gauge/gravity duality for calculations in Composite Higgs models

8/7/24, 11:30 AM

8. Ariel Zhitnitsky - Nontrivial topology in QCD, the Vacuum Energy and Large scale magnetic field of the Universe

8/8/24, 10:00 AM

We discuss the   dynamics of the topologically nontrivial sectors with non-trivial holonomy in  strongly coupled QCD    in the background of the  expanding universe characterized by the Hubble scale $H\ll \Lambda_{QCD}$. We argue that the vacuum energy and the  de Sitter phase emerge dynamically with the scale $\rho_{DE}\approx  H\Lambda_{QCD}^3 \approx (10^{-3} eV)^4$, which is   amazingly...

9. Björn Garbrecht - CP conservation in the strong interactions

8/8/24, 11:30 AM

There is no empirical evidence for CP conservation in the strong
interactions. As there generally is a renormalizable, parity-odd
coupling between the field strength and its dual, this requires an
explanation from theory.

I will therefore first review what interactions are present when
constructing an effective theory for hadrons from QCD. But I will also
point out, that from such...

4. Mohamed Anber - Nonperturbative effects from gauging higher-form symmetries

8/9/24, 10:00 AM

Higher-form symmetries are pivotal in understanding the global structure of a quantum field theory. In this talk, I review the notion of higher-form symmetry in Yang-Mills theory and demonstrate that gauging it leads to nonperturbative effects. Time permitting, I will discuss two examples. First, the Standard Model possesses a 1-form global symmetry, and gauging it gives rise to new baryon-...

12. Matthias Carosi - Self-consistent bounce from the 2PI effective action formalism

8/12/24, 10:00 AM

Starting from the 2PI effective action formalism, we develop a systematic scheme to include leading radiative corrections into the evaluation of the bubble nucleation rate during a first order phase transition. This results in a system of coupled differential equations for the 1- and 2-point functions in Euclidean spacetime, which we must solve self-consistently. As a first step, we make a...

18. James Ingoldby - Hamiltonian Truncation

8/12/24, 11:30 AM

13. Nils Wagner - False vacuum decay of excited states from finite-time instantons

8/13/24, 10:00 AM

We adapt the well-known functional instanton method to allow for the computation of excited state decay widths, efficiently bypassing the traditionally enforced infinite-time limit. With conventional instanton calculations relying on the behavior of the Euclidean propagator at late times, such investigations are, per construction, constrained to solely studying the ground state energy. By...

14. Urjit Yajnik - Domain wall networks and their cosmological signatures

8/14/24, 10:00 AM

Several unified models that embed the SM elegantly have the possibility of domain wall formation according to Kibble mechanism. We discuss the applications to cosmology. involving gravitational waves and link of leptogenesis to EDM searches.

https://inspirehep.net/literature/2613355 ;
https://inspirehep.net/literature/1835770

15. Nicklas Ramberg - Gravitational Waves From Dark Confinement with Holography

8/15/24, 10:00 AM

Gravitational waves emitted from strongly coupled QFTs are, at present, a daunting task to accurately predict due to the strong coupling.  In this talk, we demonstrate how to predict the gravitational wave spectra of Strongly coupled QFTs using holography and lattice data input for a pure SU(N) Yang-Mills theory. We will display how holography may be useful in constructing an effective...

16. Otari Sakhelashvili - Hint to Supersymmetry from GR Vacuum

8/16/24, 10:00 AM