Date of Original Version
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.
Dabaghian, Y. A. (1999). Dynamical ansatz for path integrals and nonperturbative trace formulas. Phys. Rev. E, 60(!), 324-334. doi: 10.1103/PhysRevE.60.324
Available at: https://doi.org/10.1103/PhysRevE.60.324