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Home page > Seminars > Séminaires théorie > Theory Club Mercredi 21 Juin à 12:00 en salle 646A. Kento Yasuda: "Anomalous diffusion induced by active molecules in viscoelastic medium".

Theory Club Mercredi 21 Juin à 12:00 en salle 646A. Kento Yasuda: "Anomalous diffusion induced by active molecules in viscoelastic medium"

Unless otherwise stated, seminars and defences take place at 11:30 in room 454A of Condorcet building.

Anomalous diffusion induced by active molecules in viscoelastic medium

Kento Yasuda

Abstract: With the use of the ``two-fluid model", we discuss anomalous diffusion induced by active force dipoles in viscoelastic media. Active force dipoles, such as proteins and bacteria, generate non-thermal fluctuating flows that lead to a substantial increment of the diffusion. Using the partial Green’s function of the two-fluid model, we first obtain passive (thermal) two-point correlation functions such as the displacement cross-correlation function between the two point particles separated by a finite distance. We then calculate active (non-thermal) two-point correlation functions due to active force dipoles. The time correlation of a force dipole is assumed to decay exponentially with a characteristic time scale. We show that the active component of the displacement cross-correlation function exhibits various crossovers from super-diffusive to sub-diffusive behaviors depending on the characteristic time scales and the particle separation. Our theoretical results are intimately related to the microrheology technique to detect fluctuations in non-equilibrium environment.

Mercredi 21 Juin à 12:00 en salle 646A

Contact : Équipe séminaires / Seminar team - Published on / Publié le 22 June 2017

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