The Small Field Parabolic Flow for Bosonic Many-body Models: Part 2 -   Fluctuation Integral and Renormalization
  This paper is a contribution to a program to see symmetry breaking in a weakly interacting many Boson system on a three dimensional lattice at low temperature. It is part of an analysis of the "small field" approximation to the "parabolic flow" which exhibits the formation of a "Mexican hat" potential well. Here we complete the analysis of a renormalization group step by "evaluating" the fluctuation integral and renormalizing the chemical potential. 
Tadeusz Balaban, Joel Feldman, Horst Kn\"orrer, Eugene Trubowitz
math-ph math.MP