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CIRM – Centre International de Rencontres Mathématiques

ln this workshop, we will consider variants of Artin's primitive root conjecture leading to the study of the Galois groups of various radical extensions. Beyond the case of the multiplicative group studied by Lenstra and others, there are now also interesting results for elliptic radicals, and for division points in more general abelian varieties. ln this context, the elliptic analogue of Artin's conjecture is the Lang-Trotter conjecture, which is still open after more than 40 years.

CIRM – Centre International de Rencontres Mathématiques

The frame flow of negatively curved manifolds is one of the first examples of partially hyperbolic dynamics: it is defined as an extension of the geodesic flow (which is uniformly hyperbolic) to the frame bundle of the manifold by means of parallel transport. The study of its statistical properties such as ergodicity, mixing or exponential mixing, is still widely open. We have recently shown that, under reasonable pinching assumptions on the sectional curvature, the frame flow of even-dimensional manifolds is ergodic and mixing — the odd-dimensional case being already solved by Brin-Gromov in 1980. Surprisingly, this problem is linked to questions of a very diverse nature: — in algebraic topology: the classification of the reductions of the structure groups of the sphere, — in Riemannian geometry: the existence of almost-parallel structures (e.g. Killing forms, almost-Kähler or almost-G_2 structures, etc.) — in algebraic geometry: the classification of polynomial maps between spheres. The purpose of this research project is to explore these multiple aspects of the problem and to progress on our understanding of the frame flow.

Kurse und Veranstaltungen für Studenten der Mathematik,    Geometrie und Topologie

CIRM – Centre International de Rencontres Mathématiques

CIRM – Centre International de Rencontres Mathématiques

P-adic integration on Deligne-Mumford stacks was used in several spectacular ad-vances (proof of the topological mirror symmetry conjecture of Hausel-Thaddeus and new proofs of geometric stabilization and the fundamental lemma by Groechenig-Wyss-Ziegler, new BPS-type invariants by Carocci-Orecchia-Wyss, etc.). A motivic version exists, which was developed by Yasuda following works of Batyrev and Denef-Loeser son the McKay correspondence. A variant of this theory was used by Loeser and Wyss to prove a motivic version of topological mirror symmetry and by Forey, Loeser and Wyss to obtain a motivic version of geometric stabilization and the fundamental lemma. If the theory of motivic integration on Deligne-Mumford stacks is now fully understood, its development in the more general setting of Artin stacks is still very much mysterious. Our aim is to develop the bases of such a theory with new applications in mind.

CIRM – Centre International de Rencontres Mathématiques

CIRM – Centre International de Rencontres Mathématiques

Our goal is to organise a conference devoted to interactions between pure mathematics (in particular arithmetic and algebraic geometry) and information theory (especially cryptography and coding theory). This conference will be the eighteenth edition, with the first one held in 1987, in a series that has traditionally brought together some of the top specialists in the domains of arithmetic, geometry, and information theory. The corresponding international community is very active and all of the concerned research domains are developing and expanding rapidly.

Algebraic and arithmetic geometry over finite fields and global fields. Number theory, especially explicit and algorithmic. Algebro-geometric codes constructed from curves and higher-dimensional algebraic varieties over finite fields and global fields. -Arithmetic and geometric aspects of cryptography (symmetric, public key, and post-quantum) and cryptanalysis.

Kryptographie, Blockchain und Informationssicherheit,    Informationstheorie und Grundlagen der Informatik

CIRM – Centre International de Rencontres Mathématiques

The aim is to study properties of number fields, Galois representations, and automorphic forms for which local and residual properties force a precise global behaviour. On the one hand, this relates to the theory of average class group behaviour, higher Rédei symbols and Rédei reciprocity, and various Pell equations. On the other hand, it relates to dimensions and dimension jumps for spaces of modular forms for which we simultaneously fix the Atkin-Lehner sign and the residual representation at a prime.

CIRM – Centre International de Rencontres Mathématiques

CIRM – Centre International de Rencontres Mathématiques

CIRM – Centre International de Rencontres Mathématiques

The past decades has seen some spectacular achievements on the ineraction beetween representation theory of groups or algebras of Lie type and models coming from probability or theoritical physics, cementing its reputation as a highly active area involving mathematicians from across the world. This workshop not only aims to present some of these new results, but also to explore new domains in connection with the PRC Cortipom project granted by the Agence National de la Recherche. It will feature talks given by confirmed researchers and also more informal presentations and works in small groups.

Institut des Hautes Etudes Scientifiques (IHES)

This school is open to everybody but intended primarily for young participants, including Ph.D. students and postdoctoral fellows.

CIRM – Centre International de Rencontres Mathématiques

CIRM – Centre International de Rencontres Mathématiques

CIRM – Centre International de Rencontres Mathématiques

CIRM – Centre International de Rencontres Mathématiques

CIRM – Centre International de Rencontres Mathématiques

CIRM – Centre International de Rencontres Mathématiques

CIRM – Centre International de Rencontres Mathématiques

CIRM – Centre International de Rencontres Mathématiques

CIRM – Centre International de Rencontres Mathématiques

CIRM – Centre International de Rencontres Mathématiques

Geometrie und Topologie,    Zahlentheorie, Arithmetik