We study the asymptotic distribution of norm ball averages along orbits of a lattice SO (n, 1) acting on the moduli space of pairs of orthogonal discrete subgroups of R^n+1 up to homothety. Our main result shows that, except for special 2-lattices in R³ lying in hyperplanes tangent to the light cone, these measures converge to an explicit semi-invariant probability measure supported on the space of homothety classes of pairs of orthogonal lattices tangent to the light cone. Our main motivation is a conjecture of Sargent and Shapira, which is resolved as a special case of our general result.
Bersudsky et al. (Sun,) studied this question.
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