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Fluctuation-induced dynamics of nematic topological defects
Soft Condensed Matter · Submitted 14 Jan 2022
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim Here, using numerical simulations of continuum fluctuating nematohydrodynamics we show that even in the absence of any specific form of active stresses associated with self-propulsion, mesoscopic fluctuations in either orientational alignment or hydrodynamics can independently result in flow patterns around topological defects that resemble the ones observed in active systems.
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Topological defects are increasingly being identified in various biological systems, where their characteristic flow fields and stress patterns are associated with continuous active stress generation by biological entities. Here, using numerical simulations of continuum fluctuating nematohydrodynamics we show that even in the absence of any specific form of active stresses associated with self-propulsion, mesoscopic fluctuations in either orientational alignment or hydrodynamics can independently result in flow patterns around topological defects that resemble the ones observed in active systems. Our simulations further show the possibility of extensile- and contractile-like motion of fluctuation-induced positive half-integer topological defects. Remarkably, isotropic stress fields also reproduce the experimentally measured stress patterns around topological defects in epithelia. Our findings further reveal that extensile- or contractile-like flow and stress patterns around fluctuation-induced defects are governed by passive elastic stresses and flow-aligning behavior of the nematics.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | Topological defects are increasingly being identified in various biological systems, where their characteristic flow fields and stress patterns are associated with continuous active stress generation by biological entities. | background 1.00 | 0.06 | 0.03 | asserted 0.97 |
| s1 | Here, using numerical simulations of continuum fluctuating nematohydrodynamics we show that even in the absence of any specific form of active stresses associated with self-propulsion, mesoscopic fluctuations in either orientational alignment or hydrodynamics can independently result in flow patterns around topological defects that resemble the ones observed in active systems. | contribution 0.61 | 0.96 | 0.81 | asserted 1.00 |
| s2 | Our simulations further show the possibility of extensile- and contractile-like motion of fluctuation-induced positive half-integer topological defects. | result 1.00 | 0.95 | 0.17 | hedged possibility 0.92 |
| s3 | Remarkably, isotropic stress fields also reproduce the experimentally measured stress patterns around topological defects in epithelia. | result 1.00 | 0.74 | 0.14 | asserted 0.98 |
| s4 | Our findings further reveal that extensile- or contractile-like flow and stress patterns around fluctuation-induced defects are governed by passive elastic stresses and flow-aligning behavior of the nematics. | interpretation 0.70 | 0.94 | 0.43 | asserted 1.00 |
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Original abstract
Topological defects are increasingly being identified in various biological systems, where their characteristic flow fields and stress patterns are associated with continuous active stress generation by biological entities. Here, using numerical simulations of continuum fluctuating nematohydrodynamics we show that even in the absence of any specific form of active stresses associated with self-propulsion, mesoscopic fluctuations in either orientational alignment or hydrodynamics can independently result in flow patterns around topological defects that resemble the ones observed in active systems. Our simulations further show the possibility of extensile- and contractile-like motion of fluctuation-induced positive half-integer topological defects. Remarkably, isotropic stress fields also reproduce the experimentally measured stress patterns around topological defects in epithelia. Our findings further reveal that extensile- or contractile-like flow and stress patterns around fluctuation-induced defects are governed by passive elastic stresses and flow-aligning behavior of the nematics.
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We further verify these $T^Q=T^u$ findings through mesoscopic simulations of passive nematohydrodynamics with inherent fluctuations via the multi-particle collision dynamics (MPCD) method [ref] (see [ref] for the details of the algorithm).
Mesoscopic Simulations of Active-Nematics · Introduction · 1.00
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