Exact renormalization group and many-fermion systems

Abstract

The exact renormalization group methods is applied to many fermion systems with short-range attractive force. The strength of the attractive fermion-fermion interaction is determined from the vacuum scattering length. A set of approximate flow equations is derived including fermionic and bosonic fluctuations. The numerical solutions show a phase transition to a gapped phase. The inclusion of bosonic fluctuations is found to be significant only in the small-gap regime.

Comments: Talk, given by B. Krippa on the International Workshop "Meson2004", Cracow, Poland, 3 pages