- Repository URL:
- https://digitalcommons.uri.edu/phys_facpubs/280; https://digitalcommons.uri.edu/cgi/viewcontent.cgi?article=1289&context=phys_facpubs
- Physics and Astronomy; Mathematics
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. © 1999 The American Physical Society.