Pitchfork and Hopf bifurcation threshold in stochastic equations with delayed feedback

Details Pitchfork and Hopf bifurcation threshold in stochastic equations with delayed feedback Pitchfork and Hopf bifurcation threshold in stochastic equations with delayed feedback

2008-10-23

arxiv.org/abs/0810.4348v1

Physics

Condensed Matter

Statistical Mechanics

Scientific paper

The bifurcation diagram of a model nonlinear Langevin equation with delayed feedback is obtained numerically. We observe both direct and oscillatory bifurcations in different ranges of model parameters. Below threshold, the stationary distribution function p(x) is a delta function at the trivial state x=0. Above threshold, p(x) ~ x^alpha at small x, with alpha = -1 at threshold, and monotonously increasing with the value of the control parameter above threshold. Unlike the case without delayed feedback, the bifurcation threshold is shifted by fluctuations by an amount that scales linearly with the noise intensity. With numerical information about time delayed correlations, we derive an analytic expression for p(x) which is in good agreement with the numerical results.

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