Diquark condensation at strong coupling

Abstract

The possibility of diquark condensation at sufficiently large baryon chemical potential and zero temperature is analyzed in QCD at strong coupling. In agreement with other strong coupling analysis, it is found that a first order phase transition separates a low density phase with chiral symmetry spontaneously broken from a high density phase where chiral symmetry is restored. In none of the phases diquark condensation takes place as an equilibrium state, but, for any value of the chemical potential, there is a metastable state characterized by a non-vanishing diquark condensate. The energy difference between this metastable state and the equilibrium state decreases with the chemical potential and is minimum in the high density phase. The results indicate that there is attraction in the quark-quark sector also at strong coupling, and that the attraction is more effective at high baryon density, but for infinite coupling it is not enough to produce diquark condensation. It is argued that the absence of diquark condensation is not a peculiarity of the strong coupling limit, but persists at sufficiently large finite couplings.

10 pages, 2 figures. An important discussion concerning the extension of the results to finite couplings added

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Cited by in corpus (14)

• Phase structures of strong coupling lattice QCD with finite baryon and isospin density
• Projected Entangled Pair States with non-Abelian gauge symmetries: an SU(2) study
• Phase diagram at finite temperature and quark density in the strong coupling limit of lattice QCD for color SU(3)
• Phase diagram evolution at finite coupling in strong coupling lattice QCD
• Chiral and deconfinement transitions in strong coupling lattice QCD with finite coupling and Polyakov loop effects
• The spectrum of lattice QCD with staggered fermions at strong coupling
• A chiral symmetric relativistic mean field model with logarithmic sigma potential
• Polyakov loop effects on the phase diagram in strong-coupling lattice QCD
• Order from disorder in lattice QCD at high density
• QCD at Finite temperature and density with staggered and Wilson quarks
• Phase diagram at finite temperature and quark density in the strong coupling region of lattice QCD for color SU(3)
• Cluster expansions and chiral symmetry at large density in 2-color QCD
• Strong coupling analysis of diquark condensation
• Dense baryonic matter in strong coupling lattice gauge theory