Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1998-07-09
Nucl.Phys. A642 (1998) 26-38
Physics
High Energy Physics
High Energy Physics - Phenomenology
13 pages, latex with espcrc1, 2 figures. Invited talk given at the Bielefeld workshop on QCD at Finite Density, 27-30 April 19
Scientific paper
10.1016/S0375-9474(98)00495-3
We propose a symmetry breaking scheme for QCD with three massless quarks at high baryon density wherein the color and flavor SU(3)_{color}xSU(3)_{L}xSU(3)_{R} symmetries are broken down to the diagonal subgroup SU(3)_{color+L+R} by the formation of a condensate of quark Cooper pairs. We discuss general properties that follow from this hypothesis, including the existence of gaps for quark and gluon excitations, the existence of Nambu-Goldstone bosons which are excitations of the diquark condensate, and the existence of a modified electromagnetic gauge interaction which is unbroken and which assigns integral charge to the elementary excitations. We present mean-field results for a Hamiltonian in which the interaction between quarks is modelled by that induced by single-gluon exchange. We find gaps of order 10-100 MeV for plausible values of the coupling. We discuss the effects of nonzero temperature, nonzero quark masses and instanton-induced interactions on our results.
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