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Spectral Decomposition of a Covering of \(GL(r)\): the Borel case
Heng Sun, University of Toronto, ON, Canada

Memoirs of the American Mathematical Society
2002; 63 pp; softcover
Volume: 156
ISBN-10: 0-8218-2775-8
ISBN-13: 978-0-8218-2775-8
List Price: US$48
Individual Members: US$28.80
Institutional Members: US$38.40
Order Code: MEMO/156/743
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Let \(F\) be a number field and \({\bf A}\) the ring of adeles over \(F\). Suppose \(\overline{G({\bf A})}\) is a metaplectic cover of \(G({\bf A})=GL(r,{\bf A})\) which is given by the \(n\)-th Hilbert symbol on \({\bf A}\). According to Langlands' theory of Eisenstein series, the decomposition of the right regular representation on \(L^2\left(G(F)\backslash\overline{G({\bf A})}\right)\) can be understood in terms of the residual spectrum of Eisenstein series associated with cuspidal data on standard Levi subgroups \(\overline{M}\). Under an assumption on the base field \(F\), this paper calculates the spectrum associated with the diagonal subgroup \(\overline{T}\). Specifically, the diagonal residual spectrum is at the point \(\lambda=((r-1)/2n,(r-3)/2n,\cdots,(1-r)/2n)\). Each irreducible summand of the corresponding representation is the Langlands quotient of the space induced from an irreducible automorphic representation of \(\overline{T}\), which is invariant under symmetric group \(\mathfrak{S}_r\), twisted by an unramified character of \(\overline{T}\) whose exponent is given by \(\lambda\).


Graduate students and research mathematicians interested in number theory, and the Langlands program.

Table of Contents

  • Introduction
  • Preliminaries
  • Local intertwining operators
  • Spectrum associated with the diagonal subgroup
  • Contour integration (after MW)
  • Bibliography
  • Index
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