Composite Reweighting the Glasgow Method for Finite Density QCD

TL;DR

This paper introduces a new reweighting scheme for finite density QCD that combines ensembles to reduce sampling bias and address issues in the Glasgow method.

Contribution

The paper proposes a novel reweighting approach that improves upon the Glasgow method by alleviating sampling bias through ensemble combination.

Findings

Reduced sampling bias in reweighting for finite density QCD

Alleviation of the pathological onset transition

Enhanced accuracy in fugacity expansion coefficients

Abstract

The reweighting method developed in Glasgow to circumvent the lattice action becoming complex at finite density suffers from a pathological onset transition thought to be due to the reweighting. We present a new reweighting scheme based on this approach in which we combine ensembles to alleviate the sampling bias we identify in the polynomial coefficients of the fugacity expansion.