Expanding translates of curves and Dirichlet-Minkowski theorem on linear forms

Details Expanding translates of curves and Dirichlet-Minkowski theorem on linear forms Expanding translates of curves and Dirichlet-Minkowski theorem on linear forms

2008-04-09

arxiv.org/abs/0804.1424v1

Mathematics

Number Theory

28 pages

Scientific paper

We show that a multiplicative form of Dirichlet's theorem on simultaneous Diophantine approximation as formulated by Minkowski, cannot be improved for almost all points on any analytic curve on R^k which is not contained in a proper affine subspace. Such an investigation was initiated by Davenport and Schmidt in the late sixties. The Diophantine problem is then settled by showing that certain sequence of expanding translates of curves on the homogeneous space of unimodular lattices in R^{k+1} gets equidistributed in the limit. We use Ratner's theorem on unipotent flows, linearization techniques, and a new observation about intertwined linear dynamics of various SL(m,R)'s contained in SL(k+1,R).

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