Watch a 27-minute lecture from the Indo-French workshop on Classical and quantum dynamics in out of equilibrium systems, where Samriddhi Sankar Ray explores the concept of upper critical dimension for dynamo action through a D-dimensional closure approach. Delivered at the International Centre for Theoretical Sciences in Bengaluru, this talk is part of a broader workshop fostering Indo-French academic collaboration in theoretical physics, focusing on classical and quantum out-of-equilibrium dynamics. The presentation contributes to a program covering diverse topics including non-equilibrium statistical physics, quantum many-body systems, long-range interactions, quantum resetting, generalized Gibbs ensembles, phase space quantum dynamics, and quantum measurement theory.