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arXiv · 1801.10361

Weil-Petersson Teichmüller space II: smoothness of flow curves of $H^{\frac 32}$-vector fields

Yuliang Shen·Shuan Tang
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Abstract

Given a continuous vector field $λ(t, \cdot)$ of Sobolev class $H^{\frac 32}$ on the unit circle $S^1$, the flow maps $η=g(t, \cdot)$ of the differential equation $$ \cases \frac{dη}{dt}=λ(t, η)\\ η(0,ζ)=ζ\endcases $$ are known to be quasisymmetric homeomorphisms. Very recently, Gay-Balmaz-Ratiu [GR] conjectured that the flow curve $g(t, \cdot)$ is in the Weil-Petersson class WP$(S^1)$ and is continuously differentiable with respect to the Hilbert manifold structure of WP$(S^1)$ introduced by Takhtajan-Teo [TT]. The first assertion had already been demonstrated in our previous paper [Sh2]. In this sequel to [Sh2], we will continue to deal with the Weil-Petersson class WP$(S^1)$ and completely solve this conjecture in the affirmative.

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Yuliang Shen, Shuan Tang. 2019-08-10. Weil-Petersson Teichmüller space II: smoothness of flow curves of $H^{\frac 32}$-vector fields. https://arxiv.org/abs/1801.10361

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