Hostname: page-component-5c6d5d7d68-pkt8n Total loading time: 0 Render date: 2024-08-23T12:13:24.010Z Has data issue: false hasContentIssue false

Subfactors of free products of rescalings of a II$_1$–factor

Published online by Cambridge University Press:  21 April 2004

KEN DYKEMA
Affiliation:
Department of Mathematics, Texas A&M University, College Station TX 77843-3368, U.S.A. e-mail: [email protected]

Abstract

Let $Q$ be any II$_1$–factor. It is shown that any standard lattice ${\euscript G}$ can be realized as the standard invariant of a free product of (several) rescalings of $Q$. In particular, if $Q$ has fundamental group equal to the positive reals and if $P$ is the free product of infinitely many copies of $Q$, then $P$ has subfactors giving rise to all possible standard invariants. Similarly, given a II$_1$–subfactor $N\subset M$, it is shown there are subfactors ${\hat N}\subset{\hat M}$ having the same standard invariant as $N\subset M$ but where ${\hat M}$, respectively ${\hat N}$, is the free product of $M$, respectively $N$, with rescalings of $Q$.

Type
Research Article
Copyright
2004 Cambridge Philosophical Society

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)