Quantum Versus Classical Decay Laws in Open Chaotic Systems
Dmitry V. Savin, Valentin V. Sokolov
Abstract
We study analytically the time evolution in decaying chaotic systems and discuss in detail the hierarchy of characteristic time scales that appeared in the quasiclassical region. There exist two quantum time scales: the Heisenberg time tH and the time tq=tH/κT (with κ>> 1 and T being the degree of resonance overlapping and the transmission coefficient respectively) associated with the decay. If tq < tH the quantum deviation from the classical decay law starts at the time tq and are due to the openness of the system. Under the opposite condition quantum effects in intrinsic evolution begin to influence the decay at the time tH. In this case we establish the connection between quantities which describe the time evolution in an open system and their closed counterparts.
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