Stability of a parametric harmonic oscillator with dichotomic noise

TL;DR

This paper investigates how dichotomic noise affects the stability of a harmonic oscillator, providing analytical expressions and numerical comparisons to predict stability changes in physical systems.

Contribution

It introduces a stability measure for a harmonic oscillator with telegraph process noise and derives a closed-form expression for stability analysis.

Findings

Increasing noise intensity can destabilize the fixed point.

Analytical expansions match numerical results for low noise and friction.

The model predicts stability behavior in physical systems with fluctuating parameters.

Abstract

The harmonic oscillator is a powerful model that can appear as a limit case when examining a nonlinear system. A well known fact is, that without driving, the inclusion of a friction term makes the origin of the phase space -- which is a fixpoint of the system -- linearly stable. In this work we include a telegraph process as perturbation of the oscillator's frequency, for example to describe the motion of a particle with fluctuating charge gyrating in an external magnetic field. Increasing intensity of this colored noise is capable of changing the quality of the fixed point. To characterize the stability of the system, we use a stability measure, that describes the growth of the displacement of the system's phase space position and express it in a closed form. We expand the respective exponent for light friction and low noise intensity and compare both, the exact analytic solution and the expansion to numerical values. Our findings allow stability predictions for several physical systems.