
arXiv: 1604.03645
We revisit the existence problem of heteroclinic connections in $\mathbb{R}^N$ associated with Hamiltonian systems involving potentials $W:\mathbb{R}^N\to \mathbb{R}$ having several global minima. Under very mild assumptions on $W$ we present a simple variational approach to first find geodesics minimizing length of curves joining any two of the potential wells, where length is computed with respect to a degenerate metric having conformal factor $\sqrt{W}.$ Then we show that when such a minimizing geodesic avoids passing through other wells of the potential at intermediate times, it gives rise to a heteroclinic connection between the two wells. This work improves upon the approach of P.Sternberg in $\texttt{Vector-valued local minimizers of nonconvex}$ $\texttt{variational problems}$, and represents a more geometric alternative to the approaches for finding such connections described, for example, by N.D. Alikakos and G.Fusco in $\texttt{On the connection problem for potentials with}$ $\texttt{several global minima}$, by S.V. Bolotin in $\texttt{Libration motions of natural dynamical systems}$, by J. Byeon, P. Montecchiari, and P. Rabinowitz in $\texttt{A double well potential}$ $\texttt{system}$, and by P. Rabinowitz in $\texttt{Homoclinic and heteroclinic orbits for a class of Hamiltonian}$ $\texttt{systems}$.
19 pages, 3 figures. KEYWORDS: heteroclinic orbits, multi-well potentials, minimizing geodesics
multi-well potentials, heteroclinic orbits, Metric Geometry (math.MG), Dynamical Systems (math.DS), Homoclinic and heteroclinic solutions to ordinary differential equations, Periodic, homoclinic and heteroclinic orbits; variational methods, degree-theoretic methods, [MATH.MATH-CA] Mathematics [math]/Classical Analysis and ODEs [math.CA], Mathematics - Analysis of PDEs, minimizing geodesics, Mathematics - Metric Geometry, Mathematics - Classical Analysis and ODEs, Classical Analysis and ODEs (math.CA), FOS: Mathematics, Hamiltonian system, [MATH.MATH-AP] Mathematics [math]/Analysis of PDEs [math.AP], Mathematics - Dynamical Systems, Analysis of PDEs (math.AP)
multi-well potentials, heteroclinic orbits, Metric Geometry (math.MG), Dynamical Systems (math.DS), Homoclinic and heteroclinic solutions to ordinary differential equations, Periodic, homoclinic and heteroclinic orbits; variational methods, degree-theoretic methods, [MATH.MATH-CA] Mathematics [math]/Classical Analysis and ODEs [math.CA], Mathematics - Analysis of PDEs, minimizing geodesics, Mathematics - Metric Geometry, Mathematics - Classical Analysis and ODEs, Classical Analysis and ODEs (math.CA), FOS: Mathematics, Hamiltonian system, [MATH.MATH-AP] Mathematics [math]/Analysis of PDEs [math.AP], Mathematics - Dynamical Systems, Analysis of PDEs (math.AP)
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