Matrix elements for the quantum cat map: Fluctuations in short windows

Details Matrix elements for the quantum cat map: Fluctuations in short windows Matrix elements for the quantum cat map: Fluctuations in short windows

2007-01-24

arxiv.org/abs/math/0701685v2

Mathematics

Number Theory

18 pages. Introduction revised/expanded, added references, corrected typos

Scientific paper

We study fluctuations of the matrix coefficients for the quantized cat map. We consider the sum of matrix coefficients corresponding to eigenstates whose eigenphases lie in a randomly chosen window, assuming that the length of the window shrinks with Planck's constant. We show that if the length of the window is smaller than the square root of Planck's constant, but larger than the separation between distinct eigenphases, then the variance of this sum is proportional to the length of the window, with a proportionality constant which coincides with the variance of the individual matrix elements corresponding to Hecke eigenfunctions.

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