Effective Field Theory and the Fermi Surface

Abstract

This is an introduction to the method of effective field theory. As an application, I derive the effective field theory of low energy excitations in a conductor, the Landau theory of Fermi liquids, and explain why the high-$T_c$ superconductors must be described by a different effective field theory.

Comments: 39 pages, LaTeX. Lectures presented at TASI 1992. Figures now included in epsf form