The 𝑆𝐿(2)-type and base change

Offen, Omer; Sayag, Eitan

doi:10.1090/S1088-4165-09-00353-7

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ISSN 1088-4165

The -type and base change

Authors: Omer Offen and Eitan Sayag
Journal: Represent. Theory 13 (2009), 228-235
MSC (2000): Primary 22E50; Secondary 11S37
Posted: June 23, 2009
MathSciNet review: 2515933
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Abstract: The -type of any smooth, irreducible and unitarizable representation of over a -adic field was defined by Venkatesh. We provide a natural way to extend the definition to all smooth and irreducible representations. For unitarizable representations we show that the -type of a representation is preserved under the base change with respect to any finite extension. The Klyachko model of a smooth, irreducible and unitarizable representation $\pi$ of depends only on the -type of $\pi$ . As a consequence we observe that the Klyachko model of $\pi$ and of its base change are of the same type.

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