Direct measurement and modeling of interactions in fish with burst and coast swimming
Orateur : Clément Sire
Laboratoire de Physique Théorique, CNRS & Université de Toulouse
Résumé : After some generalities concerning "intelligent" active matter ("social" vs physical "forces", effect of anisotropic sensorial stimuli, additivity of "forces"...), and in particular fish schools, I will present a series of experiments performed in Guy Theraulaz’ group at the CRCA in Toulouse, and a class of models directly inspired by them which can equally describe fish displaying smooth/continuous velocities or burst and coast swimming behavior. I will present a comparison between experiments and models in both case. In the absence of confining boundaries, the phase diagram of the model reproduces three commonly observed collective phases (swarming, schooling, milling), as well as a less common, but yet observed, extremely elongated phase. In addition, a procedure is defined and applied in order to directly measure the actual functional form of the fish-wall and wall-wall interactions.
Date et lieu : le Vendredi 6 Janvier 2017 à 11h00, salle de séminaire IRPHE