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arXiv:0706.0972

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Title: Congruence for rational points over finite fields and coniveau over local fields
Authors: Hélène Esnault, Chenyang Xu
Categories: math.NT Number Theory (math.AG Algebraic Geometry)
Comments: 8 pages

Abstract: If the $\ell$-adic cohomology of a projective smooth variety, defined over a local field $K$ with finite residue field $k$, is supported in codimension $\ge 1$, then every model over the ring of integers of $K$ has a $k$-rational point. For $K$ a $p$-adic field, this is math/0405318, Theorem 1.1. If the model $\sX$ is regular, one has a congruence $|\sX(k)|\equiv 1 $ modulo $|k|$ for the number of $k$-rational points 0704.1273, Theorem 1.1. The congruence is violated if one drops the regularity assumption.

Owner: H\'el\`ene Esnault
Version 1: Thu, 7 Jun 2007 09:23:23 GMT

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