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SUMMARY:Pulsating active matter - Etienne Fodor (Université du Luxembourg
 )
DTSTART:20230706T150000Z
DTEND:20230706T153000Z
UID:TALK201172@talks.cam.ac.uk
DESCRIPTION:\n\n\nCells in tissues consume fuel to sustain periodic mechan
 ical deformation [1]. The combination of individual deformation and local 
 interactions yields contraction waves\, propagating throughout tissues wit
 h only negligible cell displacement [2]. We consider a model of dense repu
 lsive particles whose activity drives periodic change in size of each indi
 vidual [3]. It reveals that\, in dense environments\, pulsation of synchro
 nised particles is a generic route to contraction waves. The competition b
 etween repulsion and synchronisation triggers an instability which promote
 s a wealth of dynamical patterns\, ranging from spiral waves to defect tur
 bulence. We identify the mechanisms underlying the emergence of patterns\,
  and characterize the corresponding transitions. We derive the hydrodynami
 cs of our model\, and propose an analogy with that of reaction-diffusion s
 ystems. References: [1] S. Zehnder\, M. Suaris\, M. Bellaire\, and T. Ange
 lini. (2015) Cell volume fluctuations in MDCK monolayers\, Biophys. J. [2]
  X. Serra-Picamal\, V. Conte\, R. Vincent\, E. Anon\, D. T. Tambe\, E. Baz
 ellieres\, J. P. Butler\, J. J. Fredberg\, and X. Trepat. (2012) Mechanica
 l waves during tissue expansion\, Nat. Phys. [3] Y. Zhang and &Eacute\;. F
 odor. (2022) Pulsating active matter\, arXiv:2208.06831.\n\n\n
LOCATION:Seminar Room 1\, Newton Institute
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