Fermion Condensates in Two Colours Finite Density QCD at Strong Coupling

TL;DR

This paper investigates the phase structure of two-color QCD at finite density using lattice simulations, revealing a second order phase transition with diquark condensation at a critical chemical potential.

Contribution

It introduces a novel approach to analyze fermion condensates at zero external source without extrapolation, providing new insights into the phase transition behavior.

Findings

Evidence for a second order phase transition at high density

Diquark condensate appears at a critical chemical potential

Critical chemical potential matches half the pion mass

Abstract

We study unquenched lattice SU(2) at nonzero chemical potential at strong coupling and with eight flavours of Kogut-Susskind fermions. Introducing a diquark source term we analyze the behaviour of different types of fermion condensates. Using a non standard approach we can obtain results at zero external source without extrapolations. We find strong evidences for a (high density) second order phase transition where a diquark condensate appears. The corresponding critical chemical potential is in good agreement with half the pion mass.