Effects of a multi-quark interaction on color superconducting phase transition in an extended NJL model

Abstract

We study the interplay of the chiral and the color superconducting phase transitions in an extended Nambu--Jona-Lasinio model with a multi-quark interaction that produces the nonlinear chiral-diquark coupling. We observe that this nonlinear coupling adds up coherently with the ω^2 interaction to produce the chiral-color superconductivity coexistence phase or cancel each other depending on its sign. We discuss that large coexistence region in the phase diagram is consistent with the quark-diquark picture for the nucleon whereas its smallness is the prerequisite for the applicability of the Ginzburg-Landau approach.

9 pages, 3 figures

References in corpus (1)

• In-medium omega meson mass and quark condensate in a Nambu Jona-Lasinio model constrained by recent experimental data

Cited by in corpus (4)

• Critical endpoint in the Polyakov-loop extended NJL model
• Polyakov loop extended NJL model with imaginary chemical potential
• Phase diagram in the imaginary chemical potential region and extended Z3 symmetry
• Vector-type four-quark interaction and its impact on QCD phase structure