Relative Pu conjecture for orientable surfaces with an involution

Let XX be an orientable surface of even genus with a Riemannian metric G\mathcal G that admits a fixed-point-free, orientation-reversing, isometric involution τ\tau. For pXp\in X, write distG(p,τ(p))\operatorname{dist}_{\mathcal G}(p,\tau(p)) for the distance between pp and its image, and write area(G)\operatorname{area}(\mathcal G) for the area of the metric.

Relative Pu conjecture. There is a point pXp\in X such that

distG(p,τ(p))2area(G)π4.\frac{\operatorname{dist}_{\mathcal G}(p,\tau(p))^2}{\operatorname{area}(\mathcal G)}\leq\frac{\pi}{4}.

This is a relative version of Pu's inequality arising from fillings of the circle by positive-genus surfaces. The source does not provide evidence of a resolution; it later proves the corresponding result for genus one fillings.

Sources & referencesView supporting material

Primary source

Victor Bangert, Christopher Croke, Sergei V. Ivanov and Mikhail G. Katz, “Filling area conjecture and ovalless real hyperelliptic surfaces”, arXiv:math/0405583 (2004).

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