Effective Fields in Dense Quantum Chromodynamics
  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). 
G. Nardulli (Dipartimento di Fisica Universita' di Bari and I.N.F.N.   Sezione di Bari, Italy)