Comment on "Influence of Noise on Force Measurement" [arXiv:1004.0874]

Details Comment on "Influence of Noise on Force Measurement" [arXiv:1004.0874] Comment on "Influence of Noise on Force Measurement" [arXiv:1004.0874]

2010-12-24

arxiv.org/abs/1012.5371v1

Physics

Condensed Matter

Soft Condensed Matter

Comment submitted to a PRL letter; 1 page, 1 figure

Scientific paper

In a recent Letter [arXiv:1004.0874], Volpe et al. describe experiments on a colloidal particle near a wall in the presence of a gravitational field for which they study the influence of noise on the measurement of force. Their central result is a striking discrepancy between the forces derived from experimental drift measurements via their Eq. (1), and from the equilibrium distribution. From this discrepancy they infer the stochastic calculus realised in the system. We comment, however: (a) that Eq. (1) does not hold for space-dependent diffusion, and corrections should be introduced; and (b) that the "force" derived from the drift need not coincide with the "force" obtained from the equilibrium distribution.

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