Well-rounded zeta-function of planar arithmetic lattices

Details Well-rounded zeta-function of planar arithmetic lattices Well-rounded zeta-function of planar arithmetic lattices

2012-04-17

arxiv.org/abs/1204.3826v1

Mathematics

Number Theory

12 pages; to appear in PAMS

Scientific paper

We investigate the properties of the zeta-function of well-rounded sublattices of a fixed arithmetic lattice in the plane. In particular, we show that this function has abscissa of convergence at $s=1$ with a real pole of order 2, improving upon a recent result of S. Kuehnlein. We use this result to show that the number of well-rounded sublattices of a planar arithmetic lattice of index less or equal $N$ is $O(N \log N)$ as $N \to \infty$. To obtain these results, we produce a description of integral well-rounded sublattices of a fixed planar integral well-rounded lattice and investigate convergence properties of a zeta-function of similarity classes of such lattices, building on some previous results of the author.

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