Unipotent flows on products of $SL(2,K)/Γ$'s

Details Unipotent flows on products of $SL(2,K)/Γ$'s Unipotent flows on products of $SL(2,K)/Γ$'s

2007-08-30

arxiv.org/abs/0708.4151v1

Mathematics

Representation Theory

34 pages

Scientific paper

We give a simplified and a direct proof of a special case of Ratner's theorem on closures and uniform distribution of individual orbits of unipotent flows; namely, the case of orbits of the diagonally embedded unipotent subgroup acting on $SL(2,K)/\Gamma_1\times ...\times SL(2,K)/\Gamma_n$, where $K$ is a locally compact field of characteristic 0 and each $\Gamma_i$ is a cocompact discrete subgroup of $SL(2,K)$. This special case of Ratner's theorem plays a crucial role in the proofs of uniform distribution of Heegner points by Vatsal, and Mazur conjecture on Heegner points by C. Cornut; and their generalizations in their joint work on CM-points and quaternion algebras. A purpose of the article is to make the ergodic theoretic results accessible to a wide audience.

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