The KMT homeomorphism conjecture for Delaunay circle patterns

Let SgS_g be a closed surface of genus gg, let EE be the edge set of a triangulation of SgS_g, and let Θ:E[0,π)\Theta:E\to[0,\pi) be a Delaunay angle structure. Let P(Θ)P(\Theta) be the space of cross ratio systems with prescribed Delaunay angles, and let

P(Θ)fP(Sg)πTeich(Sg)P(\Theta)\xrightarrow{f}P(S_g)\xrightarrow{\pi}\operatorname{Teich}(S_g)

be the forgetful map to the space of marked complex projective structures followed by uniformization. KMT homeomorphism conjecture. For every Delaunay angle structure Θ\Theta, the map

πf:P(Θ)Teich(Sg)\pi\circ f:P(\Theta)\to\operatorname{Teich}(S_g)

is a homeomorphism. In particular, P(Θ)P(\Theta) is a smooth manifold of real dimension 6g66g-6, and f:P(Θ)P(Sg)f:P(\Theta)\to P(S_g) is an embedding, so that f(P(Θ))f(P(\Theta)) is a section of the bundle P(Sg)Teich(Sg)P(S_g)\to\operatorname{Teich}(S_g). The conjecture would identify the deformation space of circle patterns with Teichmüller space and would establish the required smoothness; the paper discusses this as an open problem and studies consequences conditional on it.

Sources & referencesView supporting material

Primary source

Wai Yeung Lam, “Pullback of symplectic forms to the space of circle patterns”, arXiv:2404.17458 (2024).

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