Bose-Einstein condensation in strong-coupling quark color superconductor near flavor SU(3) limit

TL;DR

This paper explores the transition from BCS to BEC in a color-flavor-locked quark superconductor within the NJL model, revealing a new intermediate Bose-Einstein condensed phase near the SU(3) flavor limit.

Contribution

It provides an analytical description of the BCS-BEC crossover and identifies an intermediate Bose-Einstein condensed phase in the color-flavor-locked quark superconductor.

Findings

Prediction of BCS-BEC crossover under strong attractive interactions.

Identification of an intermediate Bose-Einstein condensed phase.

Analysis of diquark behaviors in different flavor channels.

Abstract

Near the flavor SU(3) limit, we propose an analytical description for color-flavor-locked-type Bardeen-Cooper-Schrieffer (BCS) phase in the Nambu Jona-Lasinio (NJL) model. The diquark behaviors in light-flavor and strange-flavor-involved channels and Bose-Einstein condensation (BEC) of bound diquark states are studied. When the attractive interaction between quarks is strong enough, a BCS-BEC crossover is predicted in the environment with color-flavor-locked pairing pattern. The resulting Bose-Einstein condensed phase is found to be an intergrade phase before the emergence of the previous-predicted BEC phase in two-flavor quark superconductor.