Geodesic completeness of the $H^{3/2}$ metric on $\mathrm{Diff}(S^{1})$

Abstract : Of concern is the study of the long-time existence of solutions to the Euler--Arnold equation of the right-invariant $H^{3/2}$-metric on the diffeomorphism group of the circle. In previous work by Escher and Kolev it has been shown that this equation admits long-time solutions if the order $s$ of the metric is greater than $3/2$, the behaviour for the critical Sobolev index $s=3/2$ has been left open. In this article we fill this gap by proving the analogous result also for the boundary case. The behaviour of the $H^{3/2}$-metric is, however, still different from its higher order counter parts, as it does not induce a complete Riemannian metric on any group of Sobolev diffeomorphisms.
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Contributor : Boris Kolev <>
Submitted on : Friday, April 26, 2019 - 4:37:03 PM
Last modification on : Tuesday, August 13, 2019 - 2:04:05 PM


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  • HAL Id : hal-02112529, version 1
  • ARXIV : 1904.12523


Martin Bauer, Boris Kolev, Stephen Preston. Geodesic completeness of the $H^{3/2}$ metric on $\mathrm{Diff}(S^{1})$. 2019. ⟨hal-02112529⟩



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