UK-QFT XIV

Session

II

26 Nov 2025, 11:45

Physics Building, C14 (University of Nottingham)

15. Spectral Functions of Lorentzian Quantum Gravity

Gabriel Assant

26/11/2025, 11:45

Talk

The asymptotic safety scenario, according to which a quantum field theory of gravity is made non-perturbatively renormalizable via an interacting renormalisation group fixed point, is a viable contender for the theory of quantum gravity.

Using modern functional RG methods adapted to Lorentzian signatures, we compute the asymptotically safe non-perturbative Kallen-Lehmann spectral functions...

11. Hamiltonian Truncation Framework for Gauge Theories on the Interval

James Ingoldby (Durham (IPPP))

26/11/2025, 12:10

Talk

Gauge theories in two dimensions provide a powerful testing ground for understanding strongly coupled quantum field theories. In this talk, I’ll present an alternative numerical approach based on Hamiltonian truncation for investigating these theories nonperturbatively. We work on a spatial interval and fix to axial gauge, eliminating gauge field degrees of freedom entirely, thus allowing us...

5. Lattice defect networks in 2d Yang-Mills

Elisa Iris Marieni (University of Southampton)

26/11/2025, 12:35

Talk

In the context of quantum field theory (QFT), there are no known examples of non-topological fully local theories. In the topological case, constructing a fully local theory is equivalent to finding all defects. We extend this framework to non-topological theories, proposing that defects might arise from quantising classical degrees of freedom. This idea seems particularly plausible within the...