On twisted exterior and symmetric square γ-factors

Radhika Ganapathy, Luis Lomelí

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8 Scopus citations


We establish the existence and uniqueness of twisted exterior and symmetric square γ-factors in positive characteristic by studying the Siegel Levi case of generalized spinor groups. The corresponding theory in characteristic zero is due to Shahidi. In addition, in characteristic p we prove that these twisted local factors are compatible with the local Langlands correspondence. As a consequence, still in characteristic p, we obtain a proof of the stability property of γ-factors under twists by highly ramified characters. Next we use the results on the compatibility of the Langlands-Shahidi local coefficients with the Deligne- Kazhdan theory over close local fields to show that the twisted symmetric and exterior square γ-factors, L-functions and "ε-factors are preserved. Furthermore, we obtain a formula for Plancherel measures in terms of local factors and we also show that they are preserved over close local fields.

Original languageEnglish
Pages (from-to)1105-1132
Number of pages28
JournalAnnales de l'Institut Fourier
Issue number3
StatePublished - 2015
Externally publishedYes


  • Close local fields
  • L-functions
  • Local Langlands correspondence


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