Anomalous diffusion in nonlinear oscillators with multiplicative noise.
The time-asymptotic behavior of undamped, nonlinear oscillators with a random frequency is investigated analytically and numerically. We find that averaged quantities of physical interest such as the oscillator's mechanical energy, root-mean-square position, and velocity grow algebraically with time. The scaling exponents and associated generalized diffusion constants are calculated when the oscillator's potential energy grows as a power of its position: U(x) approximately x(2n) for |x|--> infinity. Correlated noise yields anomalous diffusion exponents equal to half the value found for white noise.
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