Detlef Lehmann
The Global Minimum of the Effective Potential of the 
Many-Electron System with Delta-Interaction
(45K, TeX)

ABSTRACT.  We prove that the global minimum of the real part of the full effective 
potential of the many electron system with attractive delta interaction 
is in fact given by the BCS mean field configuration. This is a 
consequence of a simple bound which is obtained by applying Hadamard's 
inequality to the functional determinant. The second order Taylor 
expansion around the minimum is computed.