ar X iv : 0 71 2 . 33 70 v 2 [ nl in . C D ] 1 5 Ju l 2 00 8 Surprising relations between parametric level correlations and fidelity decay


Relations between fidelity decay, cross form–factor (i.e., parametric level correlations), and level velocity correlations are found both by deriving a Ward identity in a two-matrix model, and by comparing exact results, using supersymmetry techniques, in the framework of random matrix theory. A power law decay near Heisenberg time, as a function of the… (More)


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