The topological susceptibility from grand canonical simulations in the interacting instanton liquid model: zero temperature calibrations and numerical framework

TL;DR

This paper develops a grand canonical instanton liquid model to accurately estimate the topological susceptibility at zero temperature, aiming to improve axion mass predictions by modeling non-perturbative QCD effects.

Contribution

It introduces an improved grand canonical framework for the IILM and calibrates it against zero-temperature topological susceptibility data.

Findings

Calibrated the model with physical quark masses.

Established a reliable zero-temperature topological susceptibility baseline.

Set the stage for finite temperature topological susceptibility studies.

Abstract

This is the first in a series of papers which ultimately aims on improving on the present estimates on the axion mass by modeling the topological non-perturbative QCD dynamics. Axions couple to instantons and their mass is set by the topological susceptibility whose temperature dependence we estimate with the interacting instanton liquid model (IILM). Since accurate finite temperature instanton calculations have problems and do not consider fluctuations in the topological charge, we develop an improved grand canonical version of the IILM to study topological fluctuations in the quark gluon plasma. In this first paper we will calibrate the model against the topological susceptibility at zero temperature, in the chiral regime of physical quark masses.