Instanton-Induced Interactions in Finite Density QCD

TL;DR

This paper explores how instanton-induced interactions influence quark matter at finite density, revealing a transition to a color superconductor phase driven by diquark condensation.

Contribution

It demonstrates the role of instanton effects in causing chiral symmetry restoration through diquark condensation in finite density QCD.

Findings

Diquark condensation leads to color superconductivity.

Instanton interactions are attractive in both quark-antiquark and quark-quark channels.

Chiral symmetry is restored at high density due to diquark pairing.

Abstract

We consider the finite density, zero-temperature behaviour of quark matter in the instanton picture. Since the instanton-induced interactions are attractive in both $\bar{q}q$ and $qq$ channels, a competition ensues between phases of matter with condensation in either or both. It results in chiral symmetry restoration due to the onset of diquark condensation, a `colour superconductor', at finite density.