Large supremum norms and small Shannon entropy for Hecke eigenfunctions of quantized cat maps

Details Large supremum norms and small Shannon entropy for Hecke eigenfunctions of quantized cat maps Large supremum norms and small Shannon entropy for Hecke eigenfunctions of quantized cat maps

2007-11-28

arxiv.org/abs/0711.4509v1

Mathematics

Number Theory

21 pages and 4 figures

Scientific paper

10.1007/s00220-008-0627-x

This paper concerns the behavior of eigenfunctions of quantized cat maps and in particular their supremum norm. We observe that for composite integer values of N, the inverse of Planck's constant, some of the desymmetrized eigenfunctions have very small support and hence very large supremum norm. We also prove an entropy estimate and show that our functions satisfy equality in this estimate. In the case when N is a prime power with even exponent we calculate the supremum norm for a large proportion of all desymmetrized eigenfunctions and we find that for a given N there is essentially at most four different values these assume.

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