Diquarks in the color--flavor locked phase of dense quark matter

Abstract

Diquark excitations of dense quark matter are considered in the framework of the Nambu -- Jona-Lasinio model with three types of massless quarks in the presense of a quark number chemical potential $\mu$. We investigate the effective action of meson- and diquark fields at sufficiently high values of $\mu$, where the color--flavor locked (CFL) phase is realized, and prove the existence of NG-bosons in the sector of pseudoscalar diquarks. In the sector of scalar diquarks an additional NG-boson is found, corresponding to the spontaneous breaking of the U(1)${}_B$ baryon symmetry in the CFL phase. Finally, the existence of massive scalar and pseudoscalar diquark excitations is demonstrated.

10 pages, 2 figures; version accepted for publication in PRD

References in corpus (4)

• Color-Superconducting Gap in the Presence of a Magnetic Field
• Spontaneous symmetry breaking in the linear sigma model at finite chemical potential: One-loop corrections
• Manifestation of Instabilities in Nambu-Jona-Lasinio type models
• Mesons and diquarks in neutral color superconducting quark matter with $\beta$-equilibrium

Cited by in corpus (8)

• Color superconductivity in dense quark matter
• Magnetic Phases in Three-Flavor Color Superconductivity
• Bound diquarks and their Bose-Einstein condensation in strongly coupled quark matter
• Critical temperature for kaon condensation in color-flavor locked quark matter
• Mass spectrum of diquarks and mesons in the color--flavor locked phase of dense quark matter
• Pseudoscalar Goldstone bosons in the color-flavor locked phase at moderate densities
• A diagrammatic derivation of the meson effective masses in the neutral color-flavor-locked phase of Quantum Chromodynamics
• Pseudoscalar bosonic excitations in the color-flavor locked phase at moderate densities