Finite monodromy of some families of exponential sums

Given a prime p and an integer d > 1, we give a numerical criterion to decide whether the ℓ-adic sheaf associated to the one-parameter exponential sums t 7→P x ψ(xd + tx) over Fp has finite monodromy or not, and work out some explicit cases where this is computable.

Detalhes bibliográficos
Autor: Rojas León, Antonio
Tipo de documento: artigo
Estado:Versión enviada para evaluación y publicación
Data de publicação:2019
País:España
Recursos:Universidad de Sevilla (US)
Repositório:idUS. Depósito de Investigación de la Universidad de Sevilla
OAI Identifier:oai:idus.us.es:11441/83246
Acesso em linha:https://hdl.handle.net/11441/83246
https://doi.org/10.1016/j.jnt.2018.06.012
Access Level:Acceso aberto
Palavra-chave:Exponential sums
Monodromy
ℓ-Adic cohomology
Almost perfect nonlinear functions
Descrição
Resumo:Given a prime p and an integer d > 1, we give a numerical criterion to decide whether the ℓ-adic sheaf associated to the one-parameter exponential sums t 7→P x ψ(xd + tx) over Fp has finite monodromy or not, and work out some explicit cases where this is computable.