Abstract
It is shown that a recently discovered representation of the Green’s function is equivalent to a certain “dynamical ansatz” for the corresponding path integral, which brings about a convenient method of nonperturbative approximations. Based on this observation, a set of nonperturbative approximations to the trace of the Green’s function is established.
- Received 17 December 1998
DOI:https://doi.org/10.1103/PhysRevE.60.324
©1999 American Physical Society
