Systematic approximation for QCD at non-zero density

TL;DR

This paper develops a systematic approximation method for studying QCD at non-zero density using HD-QCD, analyzing baryonic density and other quantities through complex Langevin and reweighting techniques.

Contribution

It introduces an analytic expansion based on HD-QCD that systematically approximates full QCD at finite density, incorporating the full Yang-Mills action.

Findings

Data from complex Langevin simulations show consistent baryonic density behavior.

Reweighting calculations support the validity of the approximation.

The method provides a new approach to non-zero density QCD studies.

Abstract

We use the heavy dense formulation of QCD (HD-QCD) as the basis for an analytic expansion as systematic approximation to QCD at non-zero density, keeping the full Yang-Mills action. We analyse the structure of the baryonic density and other quantities and present data from the complex Langevin equation (CLE) and reweighting (RW) calculations for 2 flavours of Wilson fermions.