Effective Fields in Dense Quantum Chromodynamics

Abstract

In the high density, low temperature limit, Quantum Chromodynamics exhibits a transition to phases characterized by color superconductivity and energy gaps in the fermion spectra. We review some fundamental results obtained in this area and in particular we describe the low energy effective lagrangian describing the motion of the quasi-particles in the high density medium (High Density Effective Theory).Comment: 17 pages, Invited review talk at Workshop on Quark Gluon Plasma and Relativistic Heavy Ions, Frascati, Italy, 14-18 Jan 200