Solar energy paper index
Harmonic extension of Weil-Petersson circle homeomorphisms
One-line summary
A solar energy research paper on Harmonic extension of Weil-Petersson circle homeomorphisms.
Engineering notes
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Chinese explanation / 中文解读
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Original abstract
In this paper, we study Weil--Petersson circle homeomorphisms from the viewpoint of harmonic maps. We prove that a homeomorphism $\varphi:\mathbb S^1\to\mathbb S^1$ is Weil--Petersson if and only if its unique quasiconformal harmonic extension to the hyperbolic disk $\mathbb D$ has square-integrable Beltrami differential. Our approach is based on the anti-holomorphic $L^2$-energy of harmonic maps. We show that this energy is finite for the quasiconformal harmonic extension of every Weil--Petersson circle homeomorphism, and that, among suitable quasiconformal extensions, the harmonic extension minimizes this energy.
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