Note on the Jarzynski Equality

Details Note on the Jarzynski Equality Note on the Jarzynski Equality

2004-06-04

arxiv.org/abs/cond-mat/0406128v1

Physics

Condensed Matter

Statistical Mechanics

17 pages

Scientific paper

10.1088/1742-5468/2004/07/P07006

The Jarzynski Equality relates the free energy difference between two equilibrium states of a system to the average of the work over all irreversible paths to go from one state to the other. We claim that the derivation of this equality is flawed, introducing an ad hoc and unjustified weighting factor which handles improperly the heat exchange with a heat bath. Therefore Liphardt et al's experiment cannot be viewed as a confirmation of this equality, although the numerical deviations between the two are small. However, the Jarzynski Equality may well be a useful approximation, e.g. in measurements on single molecules in solution.

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