Article (Scientific journals)
Modeling the dynamics of a tracer particle in an elastic active gel
Ben-Isaac, E.; Fodor, Etienne; Visco, P. et al.
2015In Physical Review. E., 92 (1)
Peer reviewed
 

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Abstract :
[en] The internal dynamics of active gels both in artificial (in vitro) model systems and inside the cytoskeleton of living cells has been extensively studied with experiments of recent years. These dynamics are probed using tracer particles embedded in the network of biopolymers together with molecular motors, and distinct nonthermal behavior is observed. We present a theoretical model of the dynamics of a trapped active particle, which allows us to quantify the deviations from equilibrium behavior, using both analytic and numerical calculations. We map the different regimes of dynamics in this system and highlight the different manifestations of activity: breakdown of the virial theorem and equipartition, different elasticity-dependent ``effective temperatures,'' and distinct non-Gaussian distributions. Our results shed light on puzzling observations in active gel experiments and provide physical interpretation of existing observations, as well as predictions for future studies.
Disciplines :
Physics
Author, co-author :
Ben-Isaac, E.;  Department of Chemical Physics, Weizmann Institute of Science, Rehovot 76100, Israel
Fodor, Etienne ;  University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Physics and Materials Science (DPHYMS)
Visco, P.;  Laboratoire Matière et Systèmes Complexes, UMR 7057 CNRS/P7, Université Paris Diderot, 10 rue Alice Domon et Léonie Duquet, 75205 Paris cedex 13, France
van Wijland, F.;  Laboratoire Matière et Systèmes Complexes, UMR 7057 CNRS/P7, Université Paris Diderot, 10 rue Alice Domon et Léonie Duquet, 75205 Paris cedex 13, France
S., Gov Nir;  Department of Chemical Physics, Weizmann Institute of Science, Rehovot 76100, Israel
External co-authors :
yes
Language :
English
Title :
Modeling the dynamics of a tracer particle in an elastic active gel
Publication date :
2015
Journal title :
Physical Review. E.
ISSN :
1539-3755
Publisher :
AMER PHYSICAL SOC, ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA, Unknown/unspecified
Volume :
92
Issue :
1
Peer reviewed :
Peer reviewed
Focus Area :
Physics and Materials Science
Commentary :
Article
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