Fluctuations and rheology in active bacterial suspensions |
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Authors: | Chen D T N Lau A W C Hough L A Islam M F Goulian M Lubensky T C Yodh A G |
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Affiliation: | Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, PA 19104, USA. |
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Abstract: | We probe nonequilibrium properties of an active bacterial bath through measurements of correlations of passive tracer particles and the response function of a driven, optically trapped tracer. These measurements demonstrate violation of the fluctuation-dissipation theorem and enable us to extract the power spectrum of the active stress fluctuations. In some cases, we observe 1/sqrt[omega] scaling in the noise spectrum which we show can be derived from a theoretical model incorporating coupled stress, orientation, and concentration fluctuations of the bacteria. |
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