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X-ORIGINAL-URL:https://www.lps.u-psud.fr/
X-WR-CALNAME:Laboratoire de physique des Solides
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BEGIN:VEVENT
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DTSTART;TZID=Europe/Paris:20260529T110000
DTEND;TZID=Europe/Paris:20260529T120000
DTSTAMP:20260223T093000
UID:MEC-06358599b7afb2506e063c1ea0a09fbd@lps.u-psud.fr
CREATED:20260223
LAST-MODIFIED:20260522
PRIORITY:5
TRANSP:OPAQUE
SUMMARY:Mathis Guéneau : Spatiotemporal Characterization of Active Dynamics in Channels: Theory and Experiments
DESCRIPTION:\nAbstract:\n\n\n\nSwimming microorganisms often live in confined, complex environments, where they transition between bulk and near-surface dynamics. Their dynamics can be quantified in terms of first-passage statistics. In this talk, I will first consider run-and-tumble bacteria confined in a channel. Combining theoretical predictions based on a renewal framework with experimental observations of Escherichia coli, we study the statistics of the time required, after leaving one wall, to encounter either wall. I will discuss how incorporating heterogeneity in tumbling rates or non-exponential run-duration distributions affects the survival probability.\n\n\n\nIn the second part of the talk, I will consider active Brownian dynamics between two walls. Using a systematic expansion, we compute first-passage properties. Exploiting Siegmund duality, we infer the corresponding spatial properties for active Brownian particles confined between hard walls and reveal a transition towards a wall-accumulated state, reminiscent of experimental observations.\n\n\n\nCollaborators: Yanis Baouche (MPI PKS Dresden), Yundon Jeong (Leipzig), Christina Kurzthaler (MPI PKS Dresden), Katja M. Taute (Leipzig).\n
URL:https://www.lps.u-psud.fr/events/seminaire-physbio-mathis-gueneau/
CATEGORIES:Séminaire Matière Molle Phys-Bio
LOCATION:Orsay
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