Strong coupling analysis of diquark condensation

TL;DR

This paper investigates diquark condensation in lattice QCD at strong coupling, finding attraction in quark-quark interactions that increases with baryon density but is insufficient for condensation at infinite coupling, and arguing this persists at finite couplings.

Contribution

It provides a strong coupling analysis of diquark condensation, demonstrating the persistence of attraction and the conditions under which condensation does not occur.

Findings

Attraction exists in the quark-quark channel at strong coupling.

Diquark condensation is not achieved at infinite coupling.

The absence of condensation likely persists at large finite couplings.

Abstract

The phenomenon of diquark condensation at non-zero baryon density and zero temperature is analyzed in the strong coupling limit of lattice QCD. The results indicate that there is attraction in the quark-quark channel also at strong coupling, and that the attraction is more effective at high baryon density, but for infinite coupling it is not enough to produce diquark condensation. It is argued that the absence of diquark condensation is not a peculiarity of the strong coupling limit, but persists at sufficiently large finite couplings.