Effective temperature of active complex matter

Details Effective temperature of active complex matter Effective temperature of active complex matter

2010-12-13

arxiv.org/abs/1012.2745v2

Soft Matter 7, 3726 (2011)

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

We use molecular dynamics simulations to study the dynamics of an ensemble of interacting self-propelled semi-flexible polymers in contact with a thermal bath. Our intention is to model complex systems of biological interest. We find that an effective temperature allows one to rationalize the out of equilibrium dynamics of the system. This parameter is measured in several independent ways -- from fluctuation-dissipation relations and by using tracer particles -- and they all yield equivalent results. The effective temperature takes a higher value than the temperature of the bath when the effect of the motors is not correlated with the structural rearrangements they induce. We show how to use this concept to interpret experimental results and suggest possible innovative research directions.

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