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.

arXiv comment10 pages, 2 figures; version accepted for publication in PRD

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Cited by in corpus (14)

• 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
• Properties of the massive Gross-Neveu model with nonzero baryon and isospin chemical potentials
• Pion condensation in the Gross-Neveu model with nonzero baryon and isospin chemical potentials
• 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
• Collective modes in the color flavor locked phase
• Kaon condensation in the color-flavor-locked phase of quark matter, the Goldstone theorem, and the 2PI Hartree approximation
• NJL model of homogeneous neutral quark matter: Pseudoscalar diquark condensates revisited
• 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
• Mesons and diquarks in a color superconducting regime