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arXiv · 2505.16472

On the Lebesgue Component of Semiclassical Measures for Abelian Quantum Actions

Gabriel Rivière·Lasse L. Wolf
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Abstract

For a large class of symplectic integer matrices, the action on the torus extends to a symplectic $\mathbb{Z}^r$-action with $r\geq 2$. We apply this to the study of semiclassical measures for joint eigenfunctions of the quantization of the symplectic matrices of the $\mathbb{Z}^r$-action. In the irreducible setting, we prove that the resulting probability measures are convex combinations of the Lebesgue measure with weight $\geq 1/2$ and a zero entropy measure. We also provide a general theorem in the reducible case showing that the Lebesgue components along isotropic and symplectic invariant subtori must have total weight $\geq 1/2$.

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BibTeXRIS

Gabriel Rivière, Lasse L. Wolf. 2025-05-22. On the Lebesgue Component of Semiclassical Measures for Abelian Quantum Actions. https://doi.org/10.4171/jst%2F620

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