<p>We consider a one-parameter family <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11819_2025_7229_Article_IEq1.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="19" /> </InlineMediaObject> <EquationSource Format="TEX">\(f_{\mu}\)</EquationSource> </InlineEquation> of multidimensional diffeomorphisms such that for <InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11819_2025_7229_Article_IEq2.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="43" /> </InlineMediaObject> <EquationSource Format="TEX">\(\mu=0\)</EquationSource> </InlineEquation> the diffeomorphism <InlineEquation ID="IEq3"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11819_2025_7229_Article_IEq3.gif" Format="GIF" Height="17" Rendition="HTML" Resolution="72" Type="Linedraw" Width="17" /> </InlineMediaObject> <EquationSource Format="TEX">\(f_{0}\)</EquationSource> </InlineEquation> has a transversal homoclinic orbit to a nonhyperbolic fixed point of arbitrary finite order <InlineEquation ID="IEq4"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11819_2025_7229_Article_IEq4.gif" Format="GIF" Height="15" Rendition="HTML" Resolution="72" Type="Linedraw" Width="43" /> </InlineMediaObject> <EquationSource Format="TEX">\(n\geqslant 1\)</EquationSource> </InlineEquation> of degeneracy, and for <InlineEquation ID="IEq5"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11819_2025_7229_Article_IEq5.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="43" /> </InlineMediaObject> <EquationSource Format="TEX">\(\mu&gt;0\)</EquationSource> </InlineEquation> the fixed point becomes a hyperbolic saddle. In the paper, we give a complete description of the structure of the set <InlineEquation ID="IEq6"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11819_2025_7229_Article_IEq6.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="24" /> </InlineMediaObject> <EquationSource Format="TEX">\(N_{\mu}\)</EquationSource> </InlineEquation> of all orbits entirely lying in a sufficiently small fixed neighborhood of the homoclinic orbit. Moreover, we show that for <InlineEquation ID="IEq7"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11819_2025_7229_Article_IEq7.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="44" /> </InlineMediaObject> <EquationSource Format="TEX">\(\mu\geqslant 0\)</EquationSource> </InlineEquation> the set <InlineEquation ID="IEq8"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11819_2025_7229_Article_IEq8.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="24" /> </InlineMediaObject> <EquationSource Format="TEX">\(N_{\mu}\)</EquationSource> </InlineEquation> is hyperbolic (for <InlineEquation ID="IEq9"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11819_2025_7229_Article_IEq9.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="43" /> </InlineMediaObject> <EquationSource Format="TEX">\(\mu=0\)</EquationSource> </InlineEquation> it is nonuniformly hyperbolic) and the dynamical system <InlineEquation ID="IEq10"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11819_2025_7229_Article_IEq10.gif" Format="GIF" Height="27" Rendition="HTML" Resolution="72" Type="Linedraw" Width="41" /> </InlineMediaObject> <EquationSource Format="TEX">\(f_{\mu}\bigl{|}_{N_{\mu}}\)</EquationSource> </InlineEquation> (the restriction of <InlineEquation ID="IEq11"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11819_2025_7229_Article_IEq11.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="19" /> </InlineMediaObject> <EquationSource Format="TEX">\(f_{\mu}\)</EquationSource> </InlineEquation> to <InlineEquation ID="IEq12"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11819_2025_7229_Article_IEq12.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="24" /> </InlineMediaObject> <EquationSource Format="TEX">\(N_{\mu}\)</EquationSource> </InlineEquation>) is topologically conjugate to a certain nontrivial subsystem of the topological Bernoulli scheme of two symbols.</p>

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On the Structure of Orbits from a Neighborhood of a Transversal Homoclinic Orbit to a Nonhyperbolic Fixed Point

  • Sergey V. Gonchenko,
  • Ol’ga V. Gordeeva

摘要

We consider a one-parameter family \(f_{\mu}\) of multidimensional diffeomorphisms such that for \(\mu=0\) the diffeomorphism \(f_{0}\) has a transversal homoclinic orbit to a nonhyperbolic fixed point of arbitrary finite order \(n\geqslant 1\) of degeneracy, and for \(\mu>0\) the fixed point becomes a hyperbolic saddle. In the paper, we give a complete description of the structure of the set \(N_{\mu}\) of all orbits entirely lying in a sufficiently small fixed neighborhood of the homoclinic orbit. Moreover, we show that for \(\mu\geqslant 0\) the set \(N_{\mu}\) is hyperbolic (for \(\mu=0\) it is nonuniformly hyperbolic) and the dynamical system \(f_{\mu}\bigl{|}_{N_{\mu}}\) (the restriction of \(f_{\mu}\) to \(N_{\mu}\) ) is topologically conjugate to a certain nontrivial subsystem of the topological Bernoulli scheme of two symbols.