Mean Field, Instantons and Finite Baryon Density

Abstract

Instantons create a non-local interaction between the quarks, which at finite baryon density leads to the formation of a scalar diquark condensate and color superconductivity. A mean field approach leads to a self-consistent description of the $<\bar{q}q>$ and $<qq>$ condensates and shows the inevitability of a BCS type instability at the Fermi surface. The role of the rearrangement of the instanton ensemble for the QCD phase transitions is also discussed.

Comments: 7 pages LaTeX, 3 eps-figures included, to appear in the Proc. of the 'QCD at Finite Baryon Density'-Workshop (Bielefeld, 27.-30.04.98)