H-PIMC and M-PIMC split the potential into harmonic and anharmonic pieces, sample the harmonic piece exactly, and report 6-16x higher acceptance and 7-30x lower autocorrelation for moderately anharmonic systems at βℏω=16, with further gains when combined with the worm algorithm.
Open works by breaking the link between two beads and sampling the position of a single new bead (called the head) which lies on the same time slice
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Combining Harmonic Sampling with the Worm Algorithm to Improve the Efficiency of Path Integral Monte Carlo
H-PIMC and M-PIMC split the potential into harmonic and anharmonic pieces, sample the harmonic piece exactly, and report 6-16x higher acceptance and 7-30x lower autocorrelation for moderately anharmonic systems at βℏω=16, with further gains when combined with the worm algorithm.