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Topological Methods in Nonlinear Analysis

Morse theory for normal geodesics in sub-Riemannian manifolds with codimension one distributions
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Morse theory for normal geodesics in sub-Riemannian manifolds with codimension one distributions

Authors

  • Roberto Giambò
  • Fabio Giannoni
  • Paolo Piccione
  • Daniel V. Tausk

Keywords

Morse theory, sub-Riemannian geometry, nomal sub-Remannian minimizers

Abstract

We consider a Riemannian manifold $(\mathcal M,g)$ and a codimension one distribution $\Delta\subset T\mathcal M$ on $\mathcal M$ which is the orthogonal of a unit vector field $Y$ on $\mathcal M$. We do not make any nonintegrability assumption on $\Delta$. The aim of the paper is to develop a Morse Theory for the sub-Riemannian action functional $E$ on the space of horizontal curves, i.e. everywhere tangent to the distribution $\Delta$. We consider the case of horizontal curves joining a smooth submanifold $\mathcal P$ of $\mathcal M$ and a fixed point $q\in\mathcal M$. Under the assumption that $\mathcal P$ is transversal to $\Delta$, it is known (see [P. Piccione and D. V. Tausk, < i> Variational aspects of the geodesic problem is sub-Riemannian geometry< /i> , J. Geom. Phys. < b> 39< /b> (2001), 183–206]) that the set of such curves has the structure of an infinite dimensional Hilbert manifold and that the critical points of $E$ are the so called {\it normal extremals} (see [W. Liu and H. J. Sussmann, < i> Shortest paths for sub-Riemannian metrics on rank–$2$ distribution< /i> , Mem. Amer. Math. Soc. < b> 564< /b> (1995)]). We compute the second variation of $E$ at its critical points, we define the notions of $\mathcal P$-Jacobi field, of $\mathcal P$-focal point and of exponential map and we prove a Morse Index Theorem. Finally, we prove the Morse relations for the critical points of $E$ under the assumption of completeness for $(\mathcal M,g)$.

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Published

2003-06-01

How to Cite

1.
GIAMBÒ, Roberto, GIANNONI, Fabio, PICCIONE, Paolo and TAUSK, Daniel V. Morse theory for normal geodesics in sub-Riemannian manifolds with codimension one distributions. Topological Methods in Nonlinear Analysis. Online. 1 June 2003. Vol. 21, no. 2, pp. 273 - 291. [Accessed 8 July 2025].
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Issue

Vol 21, No 2 (June 2003)

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