Geodesic
Parametric Resonance in a Time-Dependent Harmonic Oscillator
Modelirovanie i analiz informacionnyh sistem, Tome 20 (2013) no. 3, pp. 5-28.

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In this paper, we study the phenomenon of appearance of new resonances in a time-dependent harmonic oscillator under an oscillatory decreasing force. The studied equation belongs to the class of adiabatic oscillators and arises in connection with the spectral problem for the one-dimensional Schrödinger equation with Wigner–von Neumann type potential. We use a specially developed method for asymptotic integration of linear systems of differential equations with oscillatory decreasing coefficients. This method uses the ideas of the averaging method to simplify the initial system. Then we apply Levinson's fundamental theorem to get the asymptotics for its solutions. Finally, we analyze the features of a parametric resonance phenomenon. The resonant frequencies of perturbation are found and the pointwise type of the parametric resonance phenomenon is established. In conclusion, we construct an example of a time-dependent harmonic oscillator (adiabatic oscillator) in which the parametric resonances, mentioned in the paper, may occur.
Keywords: harmonic oscillator, time-dependent frequency, resonance, method of averaging, asymptotics. 
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P. N. Nesterov. Parametric Resonance in a Time-Dependent Harmonic Oscillator. Modelirovanie i analiz informacionnyh sistem, Tome 20 (2013) no. 3, pp. 5-28. http://geodesic.mathdoc.fr/item/MAIS_2013_20_3_a0/

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