Nodal intersections and Lp restriction theorems on the torus

Jean Bourgain*, Zeév Rudnick

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

We study the number of intersections of the nodal lines of an eigenfunction of the Laplacian on the standard torus with a fixed reference curve, that is, the number of zeros of the eigenfunction restricted to the curve. An upper bound is the wave number k. When the curve has nowhere zero curvature, we conjecture that, up to a constant multiple, this should also be the correct lower bound. We give a lower bound which differs from this by an arithmetic quantity, given in terms of the maximal number of lattice points in arcs of size square root of the wave number k on a circle of radius k. According to a conjecture of Cilleruelo and Granville, this quantity is bounded, in which case we recover our conjecture. To get at the lower bound, we reduce the problem to giving a lower bound for the L1 norm of the restriction of the eigenfunction to the curve, and then to an upper bound for the L4 restriction norm.

Original languageEnglish
Pages (from-to)479-505
Number of pages27
JournalIsrael Journal of Mathematics
Volume207
Issue number1
DOIs
StatePublished - 20 Apr 2015

Funding

FundersFunder number
National Science FoundationDMS-0808042, DMS-0835373

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