Characterization of γ-factors: The asai case

Guy Henniart, Luis Lomelí

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


Let E be a separable quadratic extension of a locally compact field F of positive characteristic. Asai γ-factors are defined for smooth irreducible representations π of GLn(E). If σ is the Weil-Deligne representation of corresponding to π under the local Langlands correspondence, we show that the Asai γ-factor is the same as the Deligne-Langlands γ-factor of the Weil-Deligne representation of obtained from σ under tensor induction. This is achieved by proving that Asai γ-factors are characterized by their local properties together with their role in global functional equations for L-functions. As an immediate application, we establish the stability property of γ-factors under twists by highly ramified characters.

Original languageEnglish
Pages (from-to)4085-4099
Number of pages15
JournalInternational Mathematics Research Notices
Issue number17
StatePublished - 1 Jan 2013
Externally publishedYes


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