FM 2002-03
Version 05/07/2002

Authors: Giuseppe Benfatto, Alessandro Giuliani, Vieri Mastropietro

Title: Low temperature analysis of two dimensional Fermi systems with symmetric Fermi surface

Abstract: We prove the convergence of the perturbative expansion, based on Renormalization Group, of the two point Schwinger function of a system of weakly interacting fermions in $d=2$, with symmetric Fermi surface and up to exponentially small temperatures, close to the expected onset of superconductivity.

Key words:  Renormalization Group, Two Dimensional Fermi Systems, Fermi Surface, Finite Temperature