Margulis' short-geodesic counting conjecture for arithmetic lattices

Let GG be the ambient semisimple Lie group, let XX be its symmetric space, and let Γ\Gamma range over arithmetic lattices with vol(Γ\X)V\operatorname{vol}(\Gamma\backslash X)\leq V. For γΓ\gamma\in\Gamma, define the displacement function dγ(x)=d(γx,x)d_\gamma(x)=d(\gamma x,x), and let {γ}Γ\{\gamma\}_\Gamma denote its conjugacy class in Γ\Gamma. Margulis' conjecture. There exist positive constants ε\varepsilon and α\alpha such that

supΓ:vol(Γ\X)V#{{γ}Γ:γΓ, mindγε}V1α.\sup_{\Gamma\,:\, \operatorname{vol}(\Gamma\backslash X)\leq V}\#\{\{\gamma\}_\Gamma: \gamma\in\Gamma,\ \min d_\gamma\leq\varepsilon\}\ll V^{1-\alpha}.

The conjecture would provide sublinear control of short closed geodesics and, according to the source, would remove an injectivity-radius hypothesis from a preceding result.

Sources & referencesView supporting material

Primary source

Miklos Abert, Nicolas Bergeron, Ian Biringer, Tsachik Gelander, Nikolay Nikolov, Jean Raimbault and Iddo Samet, “On the growth of L^2-invariants for sequences of lattices in Lie groups”, arXiv:1210.2961 (2017).

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