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January  2001, 7(1): 203-218. doi: 10.3934/dcds.2001.7.203

Saddle-node bifurcation of homoclinic orbits in singular systems

Flaviano Battelli 1,

1. 

Dipartimento di Matematica "V. Volterra", Facolta' di Ingegneria-Università, Via Brecce Bianche, 1, 60131 Ancona, Italy

Received  April 2000 Published  November 2000

We consider the singularly perturbed system $\dot\xi = f_0(\xi) + \varepsilon f_1(\xi,\eta,\varepsilon)$, $\dot\eta = \varepsilon g(\xi,\eta,\varepsilon )$ where $\xi\in\Omega\subset\mathbb R^n$, $\eta\in\mathbb R$ and $\varepsilon\in\mathbb R$ is a small real parameter. We assume that $\dot\xi = f_{0}(\xi)$ has a non degenerate heteroclinic solution $\g(t)$ and that the Melnikov function $\int_{-\infty}^{+\infty} \psi^{*}(t) f_{1}(\g(t),\alpha,0)\dt$ has a double zero at some point $\alpha_{0}$. Using a functional analytic approach we show that if a suitable second order Melnikov function is not zero, the above system has, in a neighborhood of $\{\gamma(t)\}\times\mathbb R$, two heteroclinic orbits for $\varepsilon$ on one side of $\varepsilon=0$ and none for $\varepsilon$ on the other side. We also study the transversality of the intersection of the center-stable and the center-unstable manifolds along these orbits.
Keywords: Homoclinic orbits, transversality, Melnikov functions, Lyapunov-Schmidt method., saddle-node bifurcation.
Mathematics Subject Classification: 34C23, 34C37, 58F3.
Citation: Flaviano Battelli. Saddle-node bifurcation of homoclinic orbits in singular systems. Discrete & Continuous Dynamical Systems, 2001, 7 (1) : 203-218. doi: 10.3934/dcds.2001.7.203
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