Abstract:
Kinetic equations are obtained for the averaged evolution operator of a quantum system whose Hamiltonian depends on a parameter that varies randomly in the time. It is assumed that the fluctuations of the parameter occur instantaneously, i.e., during the time of a “jump” that is appreciably shorter than the mean interval between jumps, when the parameter keeps a constant value. For an arbitrary distribution with respect to the times between jumps, the “noise” effect that modulates parametrically the system is not a Markov process. Nevertheless, one can find for the response of the system closed integrodifferential
equations that contain as a special case the well-known results of the theory of sudden modulation for a homogeneous (Poisson) sequence of jumps in time. As an application, the reasons for oscillating behavior of the correlation functions of the dynamical variables in a dense medium are investigated.
Citation:
A. I. Burshtein, A. A. Zharikov, S. I. Temkin, “Non-Markov theory of sudden modulation”, TMF, 66:2 (1986), 253–263; Theoret. and Math. Phys., 66:2 (1986), 166–173
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