Berlin 2018 – wissenschaftliches Programm

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BP: Fachverband Biologische Physik

BP 22: Computational Biophysics II

BP 22.6: Vortrag

Mittwoch, 14. März 2018, 16:30–16:45, H 1058

Memoryless navigation with limited sensing capacity — Luis Gómez Nava, •Robert Großmann, and Fernando Peruani — Université Côte d'Azur, Nice, France

How should an active walker detect a target in a complex landscape, e.g. the maximal chemical concentration, given that (i) only local values of this external signal are instantaneously accessible, but no gradients, and (ii) there is no memory? This question is of broad relevance, from bacterial chemotaxis to the design of self-controlled microrobots that are supposed to perform complex tasks autonomously. The latter area of application is particularly important with regard to today's medicine aiming at fabricating micrometer-sized robots for target-specific drug-delivery, for example. Motion on the micronscale is, however, subject to a series of constraints: viscous forces dominate over inertial ones and thermal fluctuations are relevant. Navigation under these physical conditions is hence a nontrivial task. In this talk, we provide basic theoretical guidelines how to design active particles with internal states which are able to execute complex tasks such as adaptive gradient-following. We analytically link their internal dynamics of these particles to their motility properties such as drift and diffusivity enabling us to discuss how to tune the internal dynamics given a specific task. These findings are important in the design of simple navigation algorithms for robotic engineering and, moreover, may be present in various microbiological systems.