Counting orbits of integral points in families of affine homogeneous varieties and diagonal flows

Details Counting orbits of integral points in families of affine homogeneous varieties and diagonal flows Counting orbits of integral points in families of affine homogeneous varieties and diagonal flows

2011-10-26

arxiv.org/abs/1110.5773v1

Mathematics

Dynamical Systems

33 pages

Scientific paper

In this paper, we study the distribution of integral points on parametric families of affine homogeneous varieties. By the work of Borel and Harish-Chandra, the set of integral points on each such variety consists of finitely many orbits of arithmetic groups, and we establish an asymptotic formula (on average) for the number of the orbits indexed by their Siegel weights. In particular, we deduce asymptotic formulas for the number of inequivalent integral representations by decomposable forms and by norm forms in division algebras, and for the weighted number of equivalence classes of integral points on sections of quadratic surfaces. Our arguments use the exponential mixing property of diagonal flows on homogeneous spaces.

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