A self-organizing criticality mathematical model for contamination and epidemic spreading
Analysis of a nonlocal-in-time parabolic equation
March 2017, 22(2): 369-381. doi: 10.3934/dcdsb.2017017
Stability of equilibria of randomly perturbed maps
PaweŁ Hitczenko and Georgi S. Medvedev ,
Department of Mathematics, Drexel University, 3141 Chestnut Street, Philadelphia, PA 19104, USA
* Corresponding author: Georgi S. Medvedev
Received March 2016 Revised September 2016 Published December 2016
Fund Project: PH was supported by a grant from Simons Foundation grant #208766. GSM was supported by the NSF grant DMS #1412066. GSM participated in a SQuaRe group 'Stochastic stabilisation of limit-cycle dynamics in ecology and neuroscience' sponsored by the American Institute of Mathematics
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We derive a sufficient condition for stability in probability of an equilibrium of a randomly perturbed map in $\mathbb{R}^d$. This condition can be used to stabilize unstable equilibria by random forcing. Analytical results on stabilization are illustrated with numerical examples of randomly perturbed nonlinear maps in one-and two-dimensional spaces.
Keywords: Stochastic difference equation, stochastic stability, stabilization, noise.
Mathematics Subject Classification: Primary: 37H10, 93E15; Secondary: 39A30, 39A50, 34F0.
Citation: PaweŁ Hitczenko, Georgi S. Medvedev. Stability of equilibria of randomly perturbed maps. Discrete & Continuous Dynamical Systems - B, 2017, 22 (2) : 369-381. doi: 10.3934/dcdsb.2017017
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Figure 1. a) Trajectories of the logistic map $x\mapsto f(x)$ (plotted in dashed line) and that of the randomly perturbed system (1). The former approaches the stable equilibrium of the deterministic system $\bar x_2$, while the latter returns to and remains in a small neighborhood of the origin. b) A trajectory of the two-dimesional system (46) stays near the orgin after brief transients. All trajectories of the underlying deterministic system $x\mapsto Ax+q(x)$ starting off the $x^{(2)}$-axis tend to infinity. In numerical simulations shown in a and b, the following parameter values were used: $\epsilon=0.05$ and $\rho=3$.
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PaweŁ Hitczenko Georgi S. Medvedev