Physics – Mathematical Physics
Scientific paper
2005-03-28
Physics
Mathematical Physics
Scientific paper
10.1007/s00220-005-1467-6
We show that eigenfunctions of the Laplacian on certain non-compact domains
with finite area may localize at infinity--provided there is no extreme level
clustering--and thus rule out quantum unique ergodicity for such systems. The
construction is elementary and based on `bouncing ball' quasimodes whose
discrepancy is proved to be significantly smaller than the mean level spacing.
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