Memory-less response and violation of the fluctuation-dissipation theorem in colloids suspended in an active bath

• Published in: Scientific reports Vol. 7; no. 1; pp. 17588 - 7
• Main Authors: Maggi, Claudio, Paoluzzi, Matteo, Angelani, Luca, Di Leonardo, Roberto
• Format: Journal Article
• Language: English
• Published: London Nature Publishing Group UK 14.12.2017; Nature Publishing Group
• Subjects: 119/118; 14; 14/63; 639/766/530/2804; 639/766/747; Bacteria; Biomechanical Phenomena; Colloids; Copper; E coli; Equilibrium; Escherichia coli; Friction; Humanities and Social Sciences; Magnetic fields; Models, Theoretical; multidisciplinary; Noise; Reynolds number; Rheology; Science; Science (multidisciplinary); Stochastic Processes; Suspensions; Time Factors; Viscosity

We investigate experimentally and numerically the stochastic dynamics and the time-dependent response of colloids subject to a small external perturbation in a dense bath of motile E . coli bacteria. The external field is a magnetic field acting on a superparamagnetic microbead suspended in an activ...