ar X iv : 0 70 8 . 27 79 v 1 [ m at h - ph ] 2 1 A ug 2 00 7 A Survey on the Classical Limit of Quantum Dynamical Entropies ∗
نویسنده
چکیده
We analyze the behavior of quantum dynamical entropies production from sequences of quantum approximants approaching their (chaotic) classical limit. The model of the quantized hyperbolic automorphisms of the 2–torus is examined in detail and a semi–classical analysis is performed on it using coherent states, fulfilling an appropriate dynamical localization property. Correspondence between quantum dynamical entropies and the Kolmogorov–Sinai invariant is found only over time scales that are logarithmic in the quantization parameter.
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Some recent progress in the mathematical physics of rapidly rotating, dilute Bose gases in anharmonic traps is reviewed.
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