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Quantum Unique Ergodicity on Locally Symmetric Spaces: the Degenerate Lift

Published online by Cambridge University Press:  20 November 2018

Lior Silberman*
Affiliation:
Department of Mathematics, University of British Columbia, Vancouver, BC, V6T 1Z2 e-mail: lior@math.ubc.ca
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Abstract

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Given a measure ${{\bar{\mu }}_{\infty }}$ on a locally symmetric space $Y=\Gamma \backslash G/K$ obtained as a weak-$*$ limit of probability measures associated with eigenfunctions of the ring of invariant differential operators, we construct a measure ${{\bar{\mu }}_{\infty }}$ on the homogeneous space $X=\Gamma \backslash G$ that lifts ${{\bar{\mu }}_{\infty }}$ and is invariant by a connected subgroup ${{A}_{1}}\subset A$ of positive dimension, where $G=NAK$ is an Iwasawa decomposition. If the functions are, in addition, eigenfunctions of the Hecke operators, then ${{\bar{\mu }}_{\infty }}$ is also the limit of measures associated with Hecke eigenfunctions on $X$. This generalizes results of the author with A. Venkatesh in the case where the spectral parameters stay away from the walls of the Weyl chamber.

Type
Research Article
Copyright
Copyright © Canadian Mathematical Society 2015

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