Lattice QCD at finite density via a new canonical approach

TL;DR

This paper introduces a canonical approach to perform finite density lattice QCD calculations, effectively addressing the overlap problem and enabling simulations at high densities near the critical temperature.

Contribution

The authors develop and demonstrate a new canonical method for finite density lattice QCD that overcomes the overlap problem, allowing simulations at high densities.

Findings

Algorithm performs well at high densities

Results are consistent with other approaches

Simulations near the critical temperature

Abstract

We carry out a finite density calculation based on a canonical approach which is designed to address the overlap problem. Two degenerate flavor simulations are performed using Wilson gauge action and Wilson fermions on $4^4$ lattices, at temperatures close to the critical temperature $T_c\approx 170\MeV$ and large densities (5 to 20 times nuclear matter density). In this region, we find that the algorithm works well. We compare our results with those from other approaches.