EXACT QUANTUM MONTE-CARLO PROCESS FOR THE STATISTICS OF DISCRETE-SYSTEMS

We propose an exact Monte Carlo approach for the statistics of discret e quantum systems that does not employ the standard partition of the i maginary time into a mesh and does not contain small parameters. The m ethod operates with discrete objects - kinks, describing virtual trans itions at different moments in time. The global statistics of the kink s is reproduced by exact local procedures, the main one being based on the known solution for an asymmetric two-level system. (C) 1996 Ameri can Institute of Physics.