Relative Pu conjecture for orientable surfaces with an involution

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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 p∈Xp\in X, write dist⁡G(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 p∈Xp\in X such that

dist⁡G(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.

References

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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