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arXiv · 1007.4614

On Frobenius incidence varieties of linear subspaces over finite fields

Ichiro Shimada
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Abstract

We define Frobenius incidence varieties by means of the incidence relation of Frobenius images of linear subspaces in a fixed vector space over a finite field, and investigate their properties such as supersingularity, Betti numbers and unirationality. These varieties are variants of the Deligne-Lusztig varieties. We then study the lattices associated with algebraic cycles on them. We obtain a positive-definite lattice of rank 84 that yields a dense sphere packing from a 4-dimensional Frobenius incidence variety in characteristic 2.

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Ichiro Shimada. 2010-07-27. On Frobenius incidence varieties of linear subspaces over finite fields. https://arxiv.org/abs/1007.4614

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