Logarithm laws for unipotent flows, I
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We prove analogues of the logarithm laws of Sullivan and Kleinbock-Margulis in the context of unipotent flows. In particular, we obtain results for one-parameter actions on the space of lattices $SL(n, \R)/SL(n, \Z)$. The key lemma for our results says the measure of the set of unimodular lattices in $\R^n$ that does not intersect a `large' volume subset of $\R^n$ is `small'. This can be considered as a `random' analogue of the classical Minkowski theorem in the geometry of numbers.
submitted to the Journal of Modern Dynamics; revised version, paper is now split into two pieces, this first half contains results on the space of lattices, the second part will contain results on general homogeneous spaces
submitted to the Journal of Modern Dynamics; revised version, paper is now split into two pieces, this first half contains results on the space of lattices, the second part will contain results on general homogeneous spaces