Structure of extensions of free Araki–Woods factors
[Structure des extensions de facteurs d’Araki–Woods libres]
Annales de l'Institut Fourier, Online first, 42 p.

Nous étudions la structure de produits croisés d’algèbres de von Neumann provenant des actions Bogoljubov de groupes dénombrables sur les facteurs d’Araki–Woods libres. Nous résolvons notamment les questions concernant la factorialité et la classification du type de Connes. Nous donnons également des critères généraux concernant le caractère plein et la solidité forte. Comme application de nos résultats, nous obtenons des exemples de facteurs de type III 0 qui sont premiers, sans sous-algèbre de Cartan et qui possèdent une sous-algèbre maximale moyennable abélienne. Nous obtenons aussi une nouvelle classe de facteurs fortement solides de type III avec des invariants de Connes prescrits et qui ne sont pas isomorphes à des facteurs d’Araki–Woods libres.

We investigate the structure of crossed product von Neumann algebras arising from Bogoljubov actions of countable groups on Shlyakhtenko’s free Araki–Woods factors. Among other results, we settle the questions of factoriality and Connes’ type classification. We moreover provide general criteria regarding fullness and strong solidity. As an application of our main results, we obtain examples of type III 0 factors that are prime, have no Cartan subalgebra and possess a maximal amenable abelian subalgebra. We also obtain a new class of strongly solid type III factors with prescribed Connes’ invariants that are not isomorphic to any free Araki–Woods factors.

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DOI : https://doi.org/10.5802/aif.3391
Classification : 46L10,  46L40,  46L54,  46L55
Mots clés : Facteurs d’Araki–Woods libres ; Facteurs pleins ; Sous-algèbres maximales moyennables ; Théorie déformation/rigidité de Popa ; Facteurs de type III ; Ultraproduits d’algèbres de von Neumann
@unpublished{AIF_0__0_0_A41_0,
     author = {Houdayer, Cyril and Trom, Benjamin},
     title = {Structure of extensions of free {Araki{\textendash}Woods} factors},
     journal = {Annales de l'Institut Fourier},
     publisher = {Association des Annales de l{\textquoteright}institut Fourier},
     year = {2021},
     doi = {10.5802/aif.3391},
     language = {en},
     note = {Online first},
}
Houdayer, Cyril; Trom, Benjamin. Structure of extensions of free Araki–Woods factors. Annales de l'Institut Fourier, Online first, 42 p.

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