Small Scale Equidistribution of Eigenfunctions on the Torus

Stephen Lester, Zeev Rudnick

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)

Abstract

We study the small scale distribution of the L 2 mass of eigenfunctions of the Laplacian on the flat torus Td. Given an orthonormal basis of eigenfunctions, we show the existence of a density one subsequence whose L 2 mass equidistributes at small scales. In dimension two our result holds all the way down to the Planck scale. For dimensions d = 3, 4 we can restrict to individual eigenspaces and show small scale equidistribution in that context. We also study irregularities of quantum equidistribution: We construct eigenfunctions whose L 2 mass does not equidistribute at all scales above the Planck scale. Additionally, in dimension d = 4 we show the existence of eigenfunctions for which the proportion of L 2 mass in small balls blows up at certain scales.
Original languageEnglish
Article number350
Pages (from-to)279–300
JournalCommunications in Mathematical Physics
Volume2017
DOIs
Publication statusPublished - 9 Aug 2016

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