Diquark Bose condensates in high density matter and instantons

摘要: Instantons lead to strong correlations between up and down quarks with spin zero antisymmetric color wave functions. In cold dense matter, n{sub b}{gt}n{sub c}{approx_equal}1 fm {sup {minus}3} T{lt}T{sub c}{approximately}50 thinspthinspMeV, these pairs Bose condense, replacing the usual {l_angle}{bar q}q{r_angle} condensate restoring chiral symmetry. At high density, ground state is a superconductor in which diquarks play role of Cooper pairs. An interesting toy model provided by QCD two colors: it has particle-antiparticle symmetry relates {l_angle}qq{r_angle} condensates. {copyright} {ital 1998} The American Physical Society}