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Florence Marcotte (Université Côte d'Azur, INRIA, CNRS)
Monday 13 October 2025, 16:00-17:00
Tracking subcritical dynamo transitions and minimal dynamo seeds
- 👤 Speaker: Florence Marcotte (Université Côte d'Azur, INRIA, CNRS)
- 📅 Date & Time: Monday 13 October 2025, 16:00 - 17:00
- 📍 Venue: MR14 DAMTP and online
Abstract
In some astrophysical flows known to be linearly stable, finite-amplitude perturbations with favourable spatial structure can nonlinearly trigger a transition from a non-magnetic, non-turbulent state to self-sustained dynamo action and turbulence. Such transitions are suspected to significantly impact spin-down in radiative stellar layers or accretion rates in stellar discs. I will first present numerical examples of nonlinearly-triggered Tayler-Spruit dynamos in a spherical shell and zero-net-flux MRI dynamos in a quasi-Keplerian plane flow. I will then discuss how optimal control can identify stable, nontrivial (M)HD equilibria without requiring prior knowledge of the transition mechanisms.
Series This talk is part of the DAMTP Astrophysics Seminars series.
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