Discrete measured groupoid von Neumann algebras via the Gaussian deformation

Abstract

Given a discrete measured groupoid $\mathcal{G}$, we study properties of the corresponding von Neumann algebra $L(\mathcal{G})$ using the techniques of Popa's deformation/rigidity theory. More specifically, we define and study the Gaussian deformation associated with any $1$-cocycle of $\mathcal{G}$ and use it to prove primeness and fullness under appropriate assumptions. We also characterize the maximal rigid subalgebras of $L(\mathcal{G})$ and produce unique prime factorization results for algebras of the form $L({\mathcal{G}}_1\times \dots \times {\mathcal{G}}_n)$.

arXiv comment35 pages. Comments are welcome