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James MacFadyen, Jeff Wereszczynski, and Ioan Andricioaei, Directionally negative friction: A method for enhanced sampling of rare event kinetics, J. Chem. Phys. 128, 114112 (2008). Negative friction dynamics を Onsager-Machlup 汎関数を使って reweight する話。パスの情報は捨ててます。