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Symmetry Properties of the Large-Deviation Function of the Velocity of a Self-Propelled Polar Particle

Kumar, Nitin and Ramaswamy, Sriram and Sood, AK (2011) Symmetry Properties of the Large-Deviation Function of the Velocity of a Self-Propelled Polar Particle. In: Physical Review Letters, 106 (11).

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Official URL: http://prl.aps.org/abstract/PRL/v106/i11/e118001

Abstract

A geometrically polar granular rod confined in 2D geometry, subjected to a sinusoidal vertical oscillation, undergoes noisy self-propulsion in a direction determined by its polarity. When surrounded by a medium of crystalline spherical beads, it displays substantial negative fluctuations in its velocity. We find that the large-deviation function (LDF) for the normalized velocity is strongly non-Gaussian with a kink at zero velocity, and that the antisymmetric part of the LDF is linear, resembling the fluctuation relation known for entropy production, even when the velocity distribution is clearly non-Gaussian. We extract an analogue of the phase-space contraction rate and find that it compares well with an independent estimate based on the persistence of forward and reverse velocities.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to The American Physical Society.
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Depositing User: Id for Latest eprints
Date Deposited: 30 Mar 2011 08:27
Last Modified: 30 Mar 2011 08:27
URI: http://eprints.iisc.ac.in/id/eprint/36336

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