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Petr Zdenek
(Department of cond. mat. theory)
Color superconductivity
Abstract:
When we are squeezing matter so much, that baryons overlap,
qualitatively new form of matter appears - quark-gluon plasma. In this
phase macroscopic number of quarks interact, so we can expect new
phenomena. By the analogy with ordinary superconductivity, we expect,
that in low enough temperatures color superconductivity occurs, where
Cooper pairs consist of two quarks. This condensate causes spontaneous
breaking of color symmetry, following the Goldstone theorem in spectrum
of system must be NG bosons. These particles are collective excitations
of whole system. By counting gluons, these one combines with NG bosons
and color Meissner effect occurs. An elegant way to deal with color
superconductivity is NJL method in Nambu-Gorkov formalism. One can then
count with earlier neglected terms in effective interaction.
