Sieve methods for varieties over finite fields and arithmetic schemes
Bjorn Poonen1
1 Department of Mathematics University of California Berkeley, CA 94720-3840, USA
Journal de théorie des nombres de Bordeaux, Tome 19 (2007) no. 1, pp. 221-229.

Des méthodes du crible classiques en théorie analytique des nombres ont été récemment adaptées à un cadre géométrique. Dans ce nouveau cadre, les nombres premiers sont remplacés par les points fermés d’une variété algébrique sur un corps fini ou plus généralement un schéma de type fini sur ℤ. Nous présentons la méthode et certains des résultats surprenants qui en découlent. Par exemple, la probabilité qu’une courbe plane sur 𝔽 2 soit lisse est asymptotiquement 21/64 quand son degré tend vers l’infini. La plus grande partie de cet article est une exposition des résultats de [Poo04] et [Ngu05].

Classical sieve methods of analytic number theory have recently been adapted to a geometric setting. In the new setting, the primes are replaced by the closed points of a variety over a finite field or more generally of a scheme of finite type over ℤ. We will present the method and some of the surprising results that have been proved using it. For instance, the probability that a plane curve over 𝔽 2 is smooth is asymptotically 21/64 as its degree tends to infinity. Much of this paper is an exposition of results in [Poo04] and [Ngu05].

DOI : 10.5802/jtnb.583
Mots clés : Bertini theorem, finite field, Lefschetz pencil, squarefree integer, sieve
Bjorn Poonen 1

1 Department of Mathematics University of California Berkeley, CA 94720-3840, USA 
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Bjorn Poonen. Sieve methods for varieties over finite fields and arithmetic schemes. Journal de théorie des nombres de Bordeaux, Tome 19 (2007) no. 1, pp. 221-229. doi : 10.5802/jtnb.583. https://jtnb.centre-mersenne.org/articles/10.5802/jtnb.583/

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