Geodesic
Local bifurcations analysis of a state-dependent delay differential equation
Modelirovanie i analiz informacionnyh sistem, Tome 22 (2015) no. 5, pp. 711-722.

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In this paper, a first-order equation with state-dependent delay and with a nonlinear right-hand side is considered. Conditions of existence and uniqueness of the solution of initial value problem are supposed to be executed. The task is to study the behavior of solutions of the considered equation in a small neighborhood of its zero equilibrium. Local dynamics depends on real parameters which are coefficients of equation right-hand side decomposition in a Taylor series. The parameter which is a coefficient at the linear part of this decomposition has two critical values which determine a stability domain of zero equilibrium. We introduce a small positive parameter and use the asymtotic method of normal forms in order to investigate local dynamics modifications of the equation near each two critical values. We show that the stability exchange bifurcation occurs in the considered equation near the first of these critical values, and the supercritical Andronov–Hopf bifurcation occurs near the second of them (if the sufficient condition is executed). Asymptotic decompositions according to correspondent small parameters are obtained for each stable solution. Next, a logistic equation with state-dependent delay is considered as an example. The bifurcation parameter of this equation has one critical value. A simple sufficient condition of Andronov–Hopf bifurcation occurence in the considered equation near a critical value is obtained as a result of applying the method of normal forms.
Keywords: dynamical systems, equations with delay, state-dependent delay, local dynamics, stability, stability exchange bifurcation, logistic equation.
Mots-clés : Andronov–Hopf bifurcation 
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V. O. Golubenets. Local bifurcations analysis of a state-dependent delay differential equation. Modelirovanie i analiz informacionnyh sistem, Tome 22 (2015) no. 5, pp. 711-722. http://geodesic.mathdoc.fr/item/MAIS_2015_22_5_a6/

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