Parabolic transfer for real groups

Arthur, James

doi:10.1090/S0894-0347-07-00574-7

Parabolic transfer for real groups
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by James Arthur

J. Amer. Math. Soc. 21 (2008), 171-234

DOI: https://doi.org/10.1090/S0894-0347-07-00574-7

Published electronically: June 25, 2007

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Abstract:

We shall establish an identity between distributions on different real reductive groups. The distributions arise from the trace formula. They represent the main archimedean terms in both the invariant and stable forms of the trace formula. The identity will be an essential part of the comparison of these formulas. As such, it is expected to lead to reciprocity laws among automorphic representations on different groups. Our techniques are analytic. We shall show that the difference of the two sides of the proposed identity is the solution of a homogeous boundary value problem. More precisely, we shall show that it satisfies a system of linear differential equations, that it obeys certain boundary conditions around the singular set, and that it is asymptotic to zero. We shall then show that any such solution vanishes.

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