Equidistribution conjecture for dense lattice orbits on compact homogeneous spaces

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Let GG) be a connected semisimple Lie group with finite center, let Γ\Gamma be a lattice in GG, and let YY be a compact homogeneous space of GG. Let KK be a maximal compact subgroup of GG, let dd be an invariant Riemannian metric on the associated symmetric space, and write GT={g∈G:d(K,Kg)<T}G_T=\{g\in G:d(K,Kg)<T\}. Equidistribution conjecture. Every dense orbit of Γ\Gamma in YY is equidistributed: there exists a smooth measure ν\nu on YY such that, for every y∈Yy\in Y with Γy‾=Y\overline{\Gamma y}=Y and every Borel set Ω⊂Y\Omega\subset Y whose boundary has measure zero,

#{γ∈Γ: γy∈Ω, d(K,Kγ)<T}∼T→∞ν(Ω)⋅Vol⁡(GT)Vol⁡(G/Γ).\#\{\gamma\in \Gamma:\,\gamma y\in \Omega,\,d(K,K\gamma)<T\}\sim_{T\to\infty}\nu(\Omega)\cdot\frac{\operatorname{Vol}(G_T)}{\operatorname{Vol}(G/\Gamma)}.

This would extend the preceding equidistribution theorem from projective homogeneous varieties to arbitrary compact homogeneous spaces; the source provides no resolution of the conjecture.

References

Primary source

Alexander Gorodnik and Hee Oh, “Orbits of discrete subgroups on a symmetric space and the Furstenberg boundary”, arXiv:math/0405515 (2004).

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