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Groups, Representations and Analysis in Number Theory

Total Cost €


EC-Contrib. €






Project "GRANT" data sheet

The following table provides information about the project.


Organization address
postcode: 37073

contact info
title: n.a.
name: n.a.
surname: n.a.
function: n.a.
email: n.a.
telephone: n.a.
fax: n.a.

 Coordinator Country Germany [DE]
 Total cost 1˙374˙250 €
 EC max contribution 1˙374˙250 € (100%)
 Programme 1. H2020-EU.1.1. (EXCELLENT SCIENCE - European Research Council (ERC))
 Code Call ERC-2014-CoG
 Funding Scheme ERC-COG
 Starting year 2015
 Duration (year-month-day) from 2015-09-01   to  2020-08-31


Take a look of project's partnership.

# participants  country  role  EC contrib. [€] 


 Project objective

The last decade has seen remarkable progress in the study of growth in infinite families of groups. The main approach has its roots in additive combinatorics, but has truly given fruit in a non-commutative context. It is becoming clear that the central role is played not by groups in isolation, but by actions of groups. It is from this perspective that my plan addresses, at the same time, questions on growth in groups as such and hard problems in analytic number theory.

While this line of research on growth started with the study of matrix groups, it has now given strong results on permutation groups as well. Two outstanding matters are the control of dependence on rank in matrix groups, and the removal of the need for the Classification Theorem in permutation groups. Going beyond these questions on diameter and expansion, there are at least three new directions I propose to follow: towards algorithms, towards geometric group theory, and towards number theory.

Some of the main recent results in the area take the form of diameter bounds. Bounding a diameter amounts to showing that one can express any element of a group as a short product of generators. One of the main algorithmic questions consists in actually finding such an expression, and doing so rapidly. Links between geometric group theory (which studies growth in infinite groups) and the new combinatorial techniques ought to become stronger. Sofic and hyperlinear groups -- which arose in part from geometric group theory -- seem to invite a combinatorial approach.

Additive combinatorics has already shown its relevance to exponential sums, a key subject in analytic number theory. Can a newer perspective based on actions of groups give more general results? Short Kloosterman sums, which are particularly hard to bound, can be framed as a test case.

I also plan to pursue related interests in automorphic forms - which are a classical example of the relevance of group actions to number theory - and model theory.


year authors and title journal last update
List of publications.
2018 Harald Andrés Helfgott
Isomorphismes de graphes en temps quasi-polynomial (d\'après Babai et Luks, Weisfeiler-Leman...)
published pages: , ISSN: , DOI:
Astérisque 2019-06-06
2018 Harald A. Helfgott, Kate Juschenko
Soficity, short cycles and the Higman group
published pages: , ISSN: 0002-9947, DOI:
Transactions of the American Mathematical Society 2019-06-06
2019 Harald A. Helfgott
Growth in linear algebraic groups and permutation groups: towards a unified perspective
published pages: , ISSN: , DOI:
Proceedings of Groups St Andrews 2017 in Birmingham 2019-06-06

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