Joel Feldman, Manfred Salmhofer, Eugene Trubowitz
An inversion theorem in Fermi surface theory
(432K, postscript)

ABSTRACT.  We prove a perturbative inversion theorem for the map 
between the interacting and the noninteracting Fermi surface 
for a class of many fermion systems with strictly convex Fermi 
surfaces and short-range interactions between the fermions. 
This theorem gives a physical meaning to the counterterm 
function K that we use in the renormalization of these models: 
K can be identified as that part of the self-energy that causes 
the deformation of the Fermi surface when the interaction is 
turned on.