Multicanonical reweighting for the QCD topological susceptibility

TL;DR

This paper presents a reweighting technique for continuous temperature sampling in QCD, enabling efficient computation of the topological susceptibility's temperature dependence and potentially other thermodynamic observables.

Contribution

The introduced multicanonical reweighting method allows continuous temperature sampling in QCD simulations, providing a new tool for studying temperature-dependent phenomena.

Findings

Method agrees with previous susceptibility measurements.

Competitiveness with existing temperature derivative methods.

Potential application to other thermodynamic observables.

Abstract

We introduce a reweighting technique which allows for a continuous sampling of temperatures in a single simulation and employ it to compute the temperature dependence of the QCD topological susceptibility at high temperatures. The method determines the ratio of susceptibility between any two temperatures within the explored temperature range. We find that the results from the method agree with our previous determination and that it is competitive with but not better than existing methods of determining the temperature derivative of the susceptibility. The method may also be useful in exploring the temperature dependence of other thermodynamical observables in QCD in a continuous way.