A possibility of quark spin polarized phase in high density quark matter

TL;DR

This paper explores the potential for quark spin polarization in high-density quark matter using the NJL model, suggesting it could coexist with color superconductivity under certain conditions.

Contribution

It introduces the possibility of quark spin polarized phases in high-density matter within the NJL model framework, highlighting a new aspect of quark matter phases.

Findings

Quark spin polarization can occur for each flavor.

Color superconductivity may coexist with spin polarization at high density.

The NJL model with tensor interactions supports these phases.

Abstract

It is shown that the quark spin polarization may occur for each quark flavor by the use of the Nambu-Jona-Lasinio model with a tensor-type four-point interaction between quarks, while the two-flavor color superconducting phase in two-flavor case may be realized at high density quark matter.