Weak mixing behavior for the projectivized derivative extension

Shilpak Banerjee; Divya Khurana; Philipp Kunde

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arXiv · 2412.21041

Weak mixing behavior for the projectivized derivative extension

Shilpak Banerjee·Divya Khurana·Philipp Kunde

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Abstract

In both smooth and analytic categories, we construct examples of diffeomorphisms of topological entropy zero with intricate ergodic properties. On any smooth compact connected manifold of dimension 2 admitting a nontrivial circle action, we construct a smooth diffeomorphism whose differential is weakly mixing with respect to a smooth measure in the projectivization of the tangent bundle. In case of the 2-torus, we also obtain the analytic counterpart of such a diffeomorphism. The constructions are based on a quantitative version of the ``Approximation by Conjugation'' method, which involves explicitly defined conjugation maps, partial partitions, and the adaptation of a specific analytic approximation technique.

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Shilpak Banerjee, Divya Khurana, Philipp Kunde. 2024-12-30. Weak mixing behavior for the projectivized derivative extension. https://arxiv.org/abs/2412.21041

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