Vol. 255, No. 1, 2012

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Realizing the local Weil representation over a number field

Gerald Cliff and David McNeilly

Vol. 255 (2012), No. 1, 55–77
Abstract

Let F be a non-Archimedean local field whose residue field has order q and characteristic p2. We show that the Weil representations of the symplectic group Sp(2n,F) can be realized over the field

     (
|{ℚ (√p,√ − p), if q is not a square;
E0 =  ℚ (√−-p),      if q is a square and p ≡ 1 mod 4;
|(   √---
ℚ ( − 1),      if q is a square and p ≡ 3 mod 4.

Furthermore, the field E0 is shown to be optimal if q 1 mod 4.

Keywords
Weil representation, local fields
Mathematical Subject Classification 2000
Primary: 11F70, 22E50
Milestones
Received: 9 April 2009
Revised: 18 August 2011
Accepted: 24 October 2011
Published: 14 March 2012
Authors
Gerald Cliff
Department of Mathematical and Statistical Sciences
University of Alberta
Edmonton, AB  T6G 2G1
Canada
David McNeilly
Department of Mathematical and Statistical Sciences
University of Alberta
Edmonton, AB  T6G 2G1
Canada