Next seminar : Séminaire du LPTMS: Urna Basu

Tuesday, June 26 2018 at 11:00:00

Active Brownian Motion in Two Dimensions

Urna Basu (LPTMS, Université Paris-Sud)

We study the dynamics of a single active Brownian particle in a two-dimensional harmonic trap. The active particle has an intrinsic time scale set by the rotational diffusion. The harmonic trap also induces a relaxational time-scale. We show that the competition between these two time scales leads to a nontrivial time evolution for the active Brownian particle. At short times a strongly anisotropic motion emerges leading to anomalous persistence properties. At long-times, the stationary position distribution in the trap exhibits two different behaviours: a Gaussian peak at the origin in the strongly passive limit and a delocalised ring away from the origin in the opposite strongly active limit. The predicted stationary behaviours in these limits are in agreement with recent experimental observations. Réf:

Last Highlight : C’est chaud une ville la nuit

Il tend à faire plus chaud en centre-ville qu’en banlieue, mais certains centres chauffent davantage que d’autres. Une équipe de recherche internationale vient d’établir que la disposition des immeubles conditionne la température nocturne des villes – une découverte clé pour l’urbanisme de demain.

Voir la suite de l'article sur  CNRS - le journal

Ref. : J. M. Sobstyl, T. Emig, M. J. Abdolhosseini Qomi, F.-J. Ulm et R. J.-M. Pellenq, Role of City Texture in Urban Heat Islands at Nighttime, Phys. Rev. Lett. 120, 108701 (2018)


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