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Artin-Out-ME-OA

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Artin groups, mapping class groups and Out(Fn): from geometry to operator algebr...

Artin groups, mapping class groups and Out(Fn): from geometry to operator algebras via measure equivalence Negative curvature features of Artin groups, surface mapping class groups and outer automorphisms of free groups have been the subject of intense study in geometric group theory. I propose to confront this viewpoint with recent de... ver más

31/08/2027

CNRS

1M€

Presupuesto del proyecto: 1M€

Líder del proyecto

CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE... No se ha especificado una descripción o un objeto social para esta compañía.

TRL 4-5

Financiación concedida El organismo HORIZON EUROPE notifico la concesión del proyecto el día 2022-04-24

ERC-2021-STG: ERC STARTING GRANTS Scope:Objectives

I+D

Cerrada hace 3 años

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No hay información privada compartida para este proyecto. Habla con el coordinador.

1 Participantes

CNRS

1.08M€ | Lider

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Duración del proyecto: 64 meses Fecha Inicio: 2022-04-24
Fecha Fin: 2027-08-31

Líder del proyecto

CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE... No se ha especificado una descripción o un objeto social para esta compañía.

TRL 4-5

Presupuesto del proyecto 1M€

Descripción del proyecto Negative curvature features of Artin groups, surface mapping class groups and outer automorphisms of free groups have been the subject of intense study in geometric group theory. I propose to confront this viewpoint with recent developments in measured group theory and operator algebras. The focus is on obtaining structural and rigidity theorems in measure equivalence, and for von Neumann algebras associated to these groups and their ergodic actions. A first goal is to pursue the classification of right-angled Artin groups up to measure equivalence, describe the class of groups that are measure equivalent to a given one, and tackle the question of their rigidity for integrable measure equivalence. Beyond the right-angled case, I aim for new superrigidity theorems, both for quasi-isometry and measure equivalence, for many Artin groups (of hyperbolic type, of FC type); this will require describing lattices in the automorphism group of their Cayley complex. A second goal is to prove the proper proximality of Out(Fn) in the sense of Boutonnet, Ioana and Peterson, which would yield strong rigidity results for von Neumann algebras associated to its compact actions. This will require developing an analogue for Out(Fn) to the Masur-Minsky theory for mapping class groups. These new tools, as a by-product, are likely to be helpful to tackle some of the most challenging questions on Out(Fn), like the Farrell-Jones conjecture. The biggest challenge will be to investigate the group von Neumann algebra L(G), when G is an Artin group, a mapping class group, or Out(Fn). I will start with the W*-classification of right-angled Artin groups with finite outer automorphism groups. Ultimately, I aim at proving structural properties of L(G), like primeness, when G is as above and, as a long-term goal, establish rigidity phenomena.

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