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Relative representation theory and distributions on reductive groups over local fields

Project description

Advancing the representation theory of reductive groups over local fields

Harmonic analysis helps us understand physical systems in many application areas. The representation theory of a topological group is a non-commutative harmonic analysis on the group. Funded by the European Research Council, the RelRepDist project will focus on the representation theory of reductive (algebraic) groups over local fields, such as the general linear group over the field of real numbers or the field of p-adic numbers. Many tools relevant to this theory are specific to either one or the other type of field. The project will extend several tools, making them applicable to all fields. Applying these, together with existing tools, several new results in non-commutative harmonic analyses will be achieved. Among the important tools that this project aims to significantly upgrade are the generalised and degenerate Whittaker models.

Objective

One can view the representation theory of a topological group as non-commutative harmonic analysis on the group. For compact groups this view is justified by the Peter-Weyl theorem. The relative representation theory of a group is harmonic analyses on spaces with transitive group action.

I work in relative representation theory of reductive (algebraic) groups over local fields, e.g. the general linear group over the field of real numbers or the field of p-adic numbers. This theory has applications to the theory of automorphic forms, in particular to the relative trace formula.

There are many similarities between the real and p-adic cases, and some results can be formulated uniformly for all local fields, but their proofs are usually specific to each type of local fields. An important tool in this theory, that is applicable for all local fields, is the analysis of equivariant distributions on the group. However, this analysis is quite different for the two kinds of fields.

In the first part of this proposal I describe my ongoing work on some tools that will help to approach invariant distributions uniformly for all fields. I also propose to advance, using those tools, towards the proofs of some long-standing conjectures on density of orbital integrals, comparison of Lie algebra homologies, and classification of (non-compact) Gelfand pairs.

The second part of this proposal concerns generalized Whittaker models, or equivalently harmonic analyses on the quotient of a reductive group by a unipotent subgroup. In 1987 Moeglen and Waldspurger comprehensively described the role of a representation in this harmonic analyses in terms of a certain collection of nilpotent orbits attached to this representation. This result, as well as previous results on Whittaker models have many applications in representation theory and in the theory of automorphic forms. I propose to obtain an archimedean analog of this result.

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Coordinator

WEIZMANN INSTITUTE OF SCIENCE
Net EU contribution
€ 1 196 215,00
Address
Herzl street 234
7610001 Rehovot
Israel

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Activity type
Higher or Secondary Education Establishments
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Other funding
€ 0,00

Beneficiaries (1)