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SUMMARY:Spatiotemporal self-organization of motile bacteria: fluctuations 
 and large deviations - Tobias Grafke (Warwick)
DTSTART:20180130T130000Z
DTEND:20180130T140000Z
UID:TALK97705@talks.cam.ac.uk
CONTACT:Professor Mike Cates
DESCRIPTION:Active materials can self-organize in many more ways than thei
 r equilibrium counterparts. For example\, self-propelled particles with de
 nsity dependend motility can display motility-induced phase separation (MI
 PS)\, resulting in novel routes to pattern formation. In this talk it is s
 hown how internal fluctuations in the population size and swimming speed o
 f motile bacteria have a significant impact on the way they self-organize.
  Two nontrivial regimes are identified\, depending on the population carry
 ing capacity. Below a certain threshold\, the fluctuations make bacteria c
 lusters appear and disappear periodically in time at random locations in s
 pace\, with a period that is roughly independent of the noise amplitude. A
 bove the threshold\, bacteria organize in metastable clusters\, and fluctu
 ations lead to transitions between those at random times that are exponent
 ially long in the noise amplitude\, following specific out-of-equilibrium 
 pathways. Both in the quasi-periodic and the metastable regimes\, these fi
 ndings can be explained by combining tools from large deviation theory wit
 h a bifurcation analysis in which the mean bacteria density\, assumed to v
 ary slowly via birth and death\, plays the role of control parameter.\n
LOCATION:MR11\, CMS
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