On quantum ergodicity for linear maps of the torus

Details On quantum ergodicity for linear maps of the torus On quantum ergodicity for linear maps of the torus

1999-10-27

arxiv.org/abs/math/9910145v1

Mathematics

Number Theory

32 pages

Scientific paper

We prove a strong version of quantum ergodicity for linear hyperbolic maps of the torus (``cat maps''). We show that there is a density one sequence of integers so that as N tends to infinity along this sequence, all eigenfunctions of the quantum propagator at inverse Planck constant N are uniformly distributed. A key step in the argument is to show that for a hyperbolic matrix in the modular group, there is a density one sequence of integers N for which its order (or period) modulo N is somewhat larger than the square root of N.

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