Reliability of small matrices for large spectra with nonuniversal fluctuations
- 1 July 1991
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 67 (1), 1-4
- https://doi.org/10.1103/physrevlett.67.1
Abstract
We study the change of quantum spectra under two types of perturbations. One of them corresponds to the breaking of classical integrability and amounts to a crossover from level clustering to level repulsion. The second type of perturbation breaks time-reversal invariance; under conditions of classical chaos the degree of level repulsion then grows from linear to quadratic. To characterize the spectral changes we propose, for each type of transition, a distribution of nearest-neighbor spacings. Both of these ‘‘generalized Wigner surmises’’ are rigorous for suitable ensembles of 2×2 matrices but prove reliable for dynamical systems with many levels.Keywords
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