The sphaleron rate from Euclidean lattice correlators: an exploration
High Energy Physics - Lattice
2021-07-01 v3 High Energy Physics - Phenomenology
Abstract
We show how the sphaleron rate (the Minkowski rate for topological charge diffusion) can be determined by analytical continuation of the Euclidean topological-charge-density two-point function, which we investigate on the lattice, using gradient flow to reduce noise and provide improved operators which more accurately measure topology. We measure the correlators on large, fine lattices in the quenched approximation at with high precision. Based on these data we first perform a continuum extrapolation at fixed physical flow time and then extrapolate the continuum estimates to zero flow time. The extrapolated correlators are then used to study the sphaleron rate by spectral reconstruction based on perturbatively motivated models.
Cite
@article{arxiv.2012.08279,
title = {The sphaleron rate from Euclidean lattice correlators: an exploration},
author = {Luis Altenkort and Alexander M. Eller and Olaf Kaczmarek and Lukas Mazur and Guy D. Moore and Hai-Tao Shu},
journal= {arXiv preprint arXiv:2012.08279},
year = {2021}
}