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Issue 7, 2016
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Nonequilibrium phase transitions, fluctuations and correlations in an active contractile polar fluid

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Abstract

We study the patterning, fluctuations and correlations of an active polar fluid consisting of contractile polar filaments on a two-dimensional substrate, using a hydrodynamic description. The steady states generically consist of arrays of inward pointing asters and show a continuous transition from a moving lamellar phase, a moving aster street, to a stationary aster lattice with no net polar order. We next study the effect of spatio-temporal athermal noise, parametrized by an active temperature TA, on the stability of the ordered phases. In contrast to its equilibrium counterpart, we find that the active crystal shows true long range order at low TA. On increasing TA, the asters dynamically remodel, concomitantly we find novel phase transitions characterized by bond-orientational and polar order upon “heating”.

Graphical abstract: Nonequilibrium phase transitions, fluctuations and correlations in an active contractile polar fluid

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Article information


Submitted
12 Oct 2015
Accepted
16 Dec 2015
First published
22 Dec 2015

Soft Matter, 2016,12, 2040-2046
Article type
Paper
Author version available

Nonequilibrium phase transitions, fluctuations and correlations in an active contractile polar fluid

K. Gowrishankar and M. Rao, Soft Matter, 2016, 12, 2040
DOI: 10.1039/C5SM02527C

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