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28 March 2024
 
  » arxiv » math.RT/0206119

 Article overview


Normalized intertwining operators and nilpotent elements in the Langlands dual group
Alexander Braverman ; David Kazhdan ;
Date 11 Jun 2002
Subject Representation Theory; Algebraic Geometry; Number Theory | math.RT math.AG math.NT
AbstractLet $F$ be a local non-archimedian field and let $G$ be a group of points of a split reductive group over $F$. For a parabolic subgroup $P$ of $G$ we set $X_P=G/[P,P]$. For any two parabolics $P$ and $Q$ with the same Levi component $M$ we construct an explicit unitary isomorphism $L^2(X_P) o L^2(X_Q)$ (which depends on a choice of an additive character of $F$). The formula for the above isomorphism involves the action of the principal nilpotent element in the Langlands dual group of $M$ on the unipotent radicals of the corresponding dual parabolics. We use the above isomorphisms to define a new space $calS(G,M)$ of functions on $X_P$ (which depends only on $P$ and not on $M$). We explain how this space may be applied in order to reformulate in a slightly more elegant way the construction of $L$-functions associated with the standard representation of a classical group due to Gelbart, Piatetski-Shapiro and Rallis.
Source arXiv, math.RT/0206119
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