Global Level Number Variance in Integrable Systems

Details Global Level Number Variance in Integrable Systems Global Level Number Variance in Integrable Systems

2012-03-07

arxiv.org/abs/1203.1610v1

Physics

Quantum Physics

5 pages, 3 figures

Scientific paper

We study previously un-researched second order statistics - correlation function of spectral staircase and global level number variance - in generic integrable systems with no extra degeneracies. We show that the global level number variance oscillates persistently around the saturation spectral rigidity. Unlike other second order statistics - including correlation function of spectral staircase - which are calculated over energy scales much smaller than the running spectral energy, these oscillations cannot be explained within the diagonal approximation framework of the periodic orbit theory. We give detailed numerical illustration of our results using four integrable systems: rectangular billiard, modified Kepler problem, circular billiard and elliptic billiard.

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