Abstract

The main geometric terms of the Arthur-Selberg trace formula are the weighted orbital integrals. An important problem is to express these distributions as images by transfer of analogous distributions on endoscopic groups. Arthur has given a solution but under the hypothesis of the fundamental lemma of Langlands. In this paper, we prove some relations between the Fourier transforms of weighted orbital integrals on the Lie algebras of groups which are inner forms of each other. These relations hold unconditionnally and they provide some evidence for Arthur’s solution. Besides they should enable us to prove new results of transfer in the context of the non-invariant trace formula.

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