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arXiv math/9910145math.NTchao-dynmath-phmath.MPnlin.CD
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环面上线性映射的量子遍历性

On quantum ergodicity for linear maps of the torus

P. Kurlberg, Z. Rudnick

摘要:

我们证明了环面上线性双曲映射(“猫映射”)的量子遍历性的一个强版本。我们证明了存在一个密度为1的整数序列,使得当N沿该序列趋于无穷大时,在逆普朗克常数N处的量子传播子的所有本征函数都是均匀分布的。论证中的一个关键步骤是证明,对于模群中的双曲矩阵,存在一个密度为1的整数序列N,其模N的阶(或周期)略大于N的平方根。

英文摘要:

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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