Soit G un groupe algébrique réductif connexe sur un corps global F de caractéristique nulle. Nous introduisons la notion de famille évanescente de sous-groupes compacts K de G sur les adèles finis et l'utilisons pour calculer asymptotiquement les nombres de Lefschetz et (conjecturalement) le nombre de points des variétés de Shimura (attachées à G et K) sur les corps finis. De cette étude, nous tirons un cadre général donnant naissance à des familles de courbes de Shimura atteignant la borne de Drinfeld–Vlăduţ.
Let G be an algebraic, connected, reductive group over a global field F of characteristic zero. We introduce a notion of vanishing family of compact subgroups K of G over the finite adeles and use it to compute asymptotically Lefschetz numbers and (at least conjecturally) the number of points of Shimura varieties (attached to G and K) over finite fields. We deduce a general setting giving families of Shimura curves reaching the Drinfeld–Vlăduţ bound.
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@article{CRMATH_2006__342_12_899_0, author = {Sauvageot, Fran\c{c}ois}, title = {Asymptotique des vari\'et\'es de {Shimura}}, journal = {Comptes Rendus. Math\'ematique}, pages = {899--902}, publisher = {Elsevier}, volume = {342}, number = {12}, year = {2006}, doi = {10.1016/j.crma.2006.04.012}, language = {fr}, url = {http://archive.numdam.org/articles/10.1016/j.crma.2006.04.012/} }
TY - JOUR AU - Sauvageot, François TI - Asymptotique des variétés de Shimura JO - Comptes Rendus. Mathématique PY - 2006 SP - 899 EP - 902 VL - 342 IS - 12 PB - Elsevier UR - http://archive.numdam.org/articles/10.1016/j.crma.2006.04.012/ DO - 10.1016/j.crma.2006.04.012 LA - fr ID - CRMATH_2006__342_12_899_0 ER -
Sauvageot, François. Asymptotique des variétés de Shimura. Comptes Rendus. Mathématique, Tome 342 (2006) no. 12, pp. 899-902. doi : 10.1016/j.crma.2006.04.012. http://archive.numdam.org/articles/10.1016/j.crma.2006.04.012/
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