A new arithmetic D-module realizes reductive-group hypergeometric exponential sums as Frobenius traces and yields an explicit q'^(d/2) bound with a Weyl-chamber volume constant.
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Arithmetic hypergeometric $\mathcal {D}$-modules and exponential sums on reductive groups
A new arithmetic D-module realizes reductive-group hypergeometric exponential sums as Frobenius traces and yields an explicit q'^(d/2) bound with a Weyl-chamber volume constant.