title: Dynamical ansatz for path integrals and nonperturbative trace formulas.
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.
authors.affiliation: Department of Physics, University of Rhode Island, Kingston, Rhode Island 02881, USA.
authors.forename: Y A
authors.initials: YA
authors.lastname: Dabaghian