Electromagnetic effects on topological observables in QCD
Abstract
In this proceedings article we present a selected set of our lattice results regarding the effect that background electromagnetic fields have on the topology of QCD. In particular, we report on the lattice spacing-dependence of the axion-photon coupling as well as on the response of the topological susceptibility to strong magnetic fields at nonzero temperatures. We demonstrate that the ratio of topological susceptibilities at finite to zero magnetic field has a well behaved continuum limit at low temperatures using a reweighting technique. Moreover, we study the scaling of the axion-photon coupling towards the continuum limit and show that it is less severely affected by discretisation effects.
Cite
@article{arxiv.2312.14660,
title = {Electromagnetic effects on topological observables in QCD},
author = {Bastian B. Brandt and Gergely Endrődi and José Javier Hernández Hernández and Gergely Markó and Laurin Pannullo},
journal= {arXiv preprint arXiv:2312.14660},
year = {2023}
}
Comments
9 pages, 5 figures, Proceedings of the 40th International Symposium on Lattice Field Theory, July 31st - August 4th 2023, Chicago, United States of America