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arXiv · 2212.03792

D\'eveloppement fin de la contribution unipotente \`a la formule des traces sur un corps global de caract\'eristique p>0, I

Bertrand Lemaire
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Abstract

For a field $F$ and a connected reductive group $G$ defined over $F$, we develop a theory of Kempf-Rousseau-Hesselink unipotent $F$-strata in $G(F)$ that should allow us to attack open problems in positive characteristic. As an application, we use this theory to establish the fine expansion of the unipotent contribution to the (non-twisted) trace formula over a global field of characteristic $p>0$. The unipotent $F$-strata play here the role of the unipotent geometric orbits in Arthur's work over a number field. The expansion in terms of products of local distributions is not discussed here; it will be the subject of further work.

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Bertrand Lemaire. 2022-12-07. D\'eveloppement fin de la contribution unipotente \`a la formule des traces sur un corps global de caract\'eristique p>0, I. https://arxiv.org/abs/2212.03792

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