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- W4302764013 abstract "Active matter with local polar or nematic order is subject to the well-known Simha-Ramaswamy instability. It is so far unclear how, despite this instability, biological tissues can undergo robust active anisotropic deformation during animal morphogenesis. Here we show that protein concentration gradients (e.g. morphogen gradients), which are known to control large-scale coordination among cells, can stabilize such deformations. To this end, we study a hydrodynamic model of an active polar material. To account for the effect of the protein gradient, the polar field is coupled to the boundary-provided gradient of a scalar field that also advects with material flows. Focusing on the large system size limit, we show in particular: (i) The system can be stable for an effectively extensile coupling between scalar field gradient and active stresses, i.e. gradient-extensile coupling, while it is always unstable for a gradient-contractile coupling. Intriguingly, there are many systems in the biological literature that are gradient-extensile, while we could not find any that are clearly gradient-contractile. (ii) Stability is strongly affected by the way polarity magnitude is controlled. Taken together, our findings, if experimentally confirmed, suggest new developmental principles that are directly rooted in active matter physics." @default.
- W4302764013 created "2022-10-07" @default.
- W4302764013 creator A5015708769 @default.
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- W4302764013 date "2023-01-01" @default.
- W4302764013 modified "2023-10-05" @default.
- W4302764013 title "Deforming polar active matter in a scalar field gradient" @default.
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- W4302764013 doi "https://doi.org/10.1088/1367-2630/acb2e5" @default.
- W4302764013 hasPublicationYear "2023" @default.
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