By: Sumesh Thampi
From: University of Oxford
At: Instituto de Investigação Interdisciplinar, Anfiteatro
The flow properties of a continuum model for an active nematic is studied andÂ compared with recent experiments on suspensions of microtubule bundles and molecularÂ motors. The velocity correlation length is found to be independent of the strength of theÂ activity while the characteristic velocity scale increases monotonically as the activity isÂ increased, both in agreement with the experimental observations. We argue that the lengthÂ scale is set by the dynamics of topological defects. We also show the difference inÂ behaviourÂ of extensile and contractile systems in terms of defect creation and annihilation mechanisms.