Abstract
Let |$G=SL_2(\mathbb{R})^d$| and |$\Gamma=\Gamma_0^d$| with |$\Gamma_0$| a lattice in |$SL_2(\mathbb{R})$|. Let |$S$| be any “curved” submanifold of small codimension of a maximal horospherical subgroup of |$G$| relative to an |$\mathbb{R}$|-diagonalizable element |$a$| in the diagonal of |$G$|. Then for |$S$| compact our result can be described by saying that |$a^n \text{vol}_S$| converges in an effective way to the volume measure of |$G/\Gamma$| when |$n\to \infty$|, with |$\text{vol}_S$| the volume measure on |$S$|.
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