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Relative Langlands Functoriality, Trace Formulas and Harmonic Analysis

Project description

From the Langlands program to relative Langlands, with important new instances

The Langlands program, proposed more than 50 years ago, is often seen as the largest project in modern mathematics. Garnering the 2018 Abel prize, one of mathematics’ most prestigious awards, it is a grand unified theory of mathematics describing far-ranging connections between algebra, number theory and analysis. Functoriality is a central concept, describing deep relationships between the local and automorphic spectra of different groups. The relative Langlands program is a promising recent generalisation of the classical Langlands program. The EU-funded RELANTRA project intends to make fundamental contributions to the development of these concepts with a focus on the local setting, leading to significant new instances of relative Langlands correspondences/functorialities.


The Langlands program is a web of vast and far-reaching conjectures connecting seemingly distinct areas of mathematics that are number theory and representation theory. At the heart of this program lies an important principle called functoriality, that postulates the existence of deep relations between the automorphic representations of different groups, as well as related central analytic objects called automorphic L-functions. Recently, a new and particularly promising way to look at these notions, and that has come to be called the relative Langlands program, has emerged. It essentially consists in replacing groups by certain homogeneous spaces and to study their automorphic or local spectra. As for the usual Langlands program, trace formulas are essential tools in the relative setting both to tackle new conjectures than to deepen our understanding of the underlying principles. A main theme of this proposal would be to make fundamental new contributions to the development of these central objects in the local setting notably by: (1) Studying systematically the spectral expansions of certain simple versions especially in the presence of an outer automorphism (twisted trace formula) (2) Developing far-reaching local relative trace formulas for general spherical varieties making in particular original new connections to the geometry of cotangent bundles. These progress would then be applied to establish new and important instances of relative Langlands correspondences/functorialities. In a slightly different but related direction, I also aim to study and develop other important tools of harmonic analysis in a relative context, including Plancherel formulas and new kind of Paley-Wiener theorems, with possible applications to new global comparison of trace formulas and factorization of automorphic periods.



Net EU contribution
€ 1 409 559,00
Rue michel ange 3
75794 Paris

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Ile-de-France Ile-de-France Paris
Activity type
Research Organisations
Other funding
€ 0,00