Spatiotemporal Characterization of Active Dynamics in Channels: Theory and Experiments
Mathis Guéneau (MPI-PKS, Dresde)
| Quand ? |
Le 28/05/2026, de 11:00 à 12:00 |
|---|---|
| Où ? | Amphi SVT |
| S'adresser à | Alexis Poncet |
| Participants |
Mathis Guéneau |
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Abstract:
Swimming 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.
In 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.
Collaborators: Yanis Baouche (MPI PKS Dresden), Yundon Jeong (Leipzig), Christina Kurzthaler (MPI PKS Dresden), Katja M. Taute (Leipzig).