Ehrenpreis conjecture for finite hyperbolic covers

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Let Σ\Sigma and Σ′\Sigma' be closed Riemann surfaces of genus greater than 11, regarded as Riemannian manifolds with metrics of curvature −1-1. The Ehrenpreis conjecture concerns finite-degree isometric covers of these surfaces. Ehrenpreis conjecture. For any ϵ>0\epsilon>0, there are finite-degree isometric covers Z→ΣZ\rightarrow\Sigma and Z′→Σ′Z'\rightarrow\Sigma' whose total spaces are (1+ϵ)(1+\epsilon)-quasiisometric. This is the geometric, asymptotic analogue of the fact that the universal covers are both isometric to H2\mathbb H^2. The paper states that an L1L^1 version has been solved, while this formulation is presented as the traditional Ehrenpreis conjecture.

References

Primary source

T. M. Gendron, “The L^1 Ehrenpreis Conjecture”, arXiv:math/0506509 (2005).

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