Counting and equidistribution in quaternionic Heisenberg groups

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AbstractWe develop the relationship between quaternionic hyperbolic geometry and arithmetic counting or equidistribution applications, that arises from the action of arithmetic groups on quaternionic hyperbolic spaces, especially in dimension 2. We prove a Mertens counting formula for the rational points over a definite quaternion algebraAover${\mathbb{Q}}$in the light cone of quaternionic Hermitian forms, as well as a Neville equidistribution theorem of the set of rational points overAin quaternionic Heisenberg groups.