Locally Divergent Orbits on Hilbert Modular Spaces

Details Locally Divergent Orbits on Hilbert Modular Spaces Locally Divergent Orbits on Hilbert Modular Spaces

2010-12-29

arxiv.org/abs/1012.6006v3

Mathematics

Dynamical Systems

The reason to replace the previous (second) version was a typo in the formulation of Conjecture A. In comparison with the firs

Scientific paper

We describe the closures of locally divergent orbitsunder the action of tori on Hilbert modular spaces of rank r = 2. In particular, we prove that if D is a maximal R-split torus acting on a real Hilbert modular space then every locally divergent non-closed orbit is dense for r > 2 and its closure is a finite union of tori orbits for r = 2. Our results confirm an orbit rigidity conjecture of Margulis in all cases except for (i) r = 2 and, (ii) r > 2 and the Hilbert modular space corresponds to a CM-field; in the cases (i) and (ii) our results contradict the conjecture. As an application, we describe the set of values at integral points of collections of non-proportional, split, binary, quadratic forms over number fields.

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