QCD phases at high density and instantons

Details QCD phases at high density and instantons QCD phases at high density and instantons

1998-07-03

arxiv.org/abs/hep-ph/9807243v1

Nucl.Phys. A642 (1998) 14-25

Physics

High Energy Physics

High Energy Physics - Phenomenology

invited talk at "QCD at finite baryon density", Bielefeld, 1998

Scientific paper

10.1016/S0375-9474(98)00494-1

The talk is an introduction into diquark condensation phenomena which occur in QCD at high energy density. They are driven by instantons and instanton-antiinstanton pairs (or ``molecules''), which generate attraction in some qq channels. A number of phases is possible, with or without restoration of chiral symmetry: the work is not finished and we do not yet know which take place in real QCD. We also emphasize that specific diquark correlations play a significant role in baryon structure, in particular making that of a nucleon very different of a $\Delta$ (or other member of a decuplet). This ``small $N_c$'' scenario based on comparison to QCD with two colors is contrasted with the ``large $N_c$'' one.

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