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Wierschem_PathIntegralMC - Path Integral Monte Carlo Keola...

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Path Integral Monte Carlo Keola Wierschem Physics Department, FSU Path Integral Monte Carlo – p. 1/
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What is Path Integral Monte Carlo? A computational technique for simulating quantum systems at non-zero temperature. PIMC allows us to use particle interactions at some "high" temperature (where behavior is classical) to study a system at much lower temperature, where quantum fluctuations are important. PIMC is an exact method. In principle, no approximations are needed. In practice, particle interactions are not exact, and other approximations are made for convienence. Path Integral Monte Carlo – p. 2/
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What is PIMC used for? In 1953, Feynman suggested the use of Path Integrals to explain superfluidity in He 4 . Superfliudity can be understood as global permutation chains between helium atoms (indistinguishable bosons). In the early 1980’s, the computer resources were finally available to implement a full PIMC study of liquid helium II (Ceperley & Pollock).
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