Abstract
In this paper, let m ≥ 1 be an integer, M be an m-dimensional compact Riemannian manifold. Firstly the linearized Poincaré map of the Lagrangian system at critical point x
is explicitly given, then we prove that Morse index and Maslov-type index of x are well defined whether the manifold M is orientable or not via the parallel transport method which makes no appeal to unitary trivialization and establish the relation of Morse index and Maslov-type index, finally derive a criterion for the instability of critical point and orientation of M and obtain the formula for two Maslov-type indices.
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I would like to sincerely thank Professor Hui Liu for his valuable discussions and careful reading of the manuscript.
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Supported by NSFC (Grant Nos. 11871356, 11871368)
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Zhu, G.S. Indices and Stability of the Lagrangian System on Riemannian Manifold. Acta. Math. Sin.-English Ser. 37, 565–580 (2021). https://doi.org/10.1007/s10114-020-9311-7
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DOI: https://doi.org/10.1007/s10114-020-9311-7