Commuting-Square Subfactors and Central Sequences

Details Commuting-Square Subfactors and Central Sequences Commuting-Square Subfactors and Central Sequences

2008-08-19

arxiv.org/abs/0808.2487v1

Mathematics

Operator Algebras

18 pages

Scientific paper

Let $M_0 \subset M_1$ be a finite-index infinite-depth hyperfinite $II_1$ subfactor and $\omega$ a free ultrafilter of the natural numbers. We show that if this subfactor is constructed from a commuting square then the central sequence inclusion $M_0^{\omega} \cap M_1' \subset (M_0)_{\omega}$ has infinite Pimnser-Popa index. We will also demonstrate this result for certain infinite-depth hyperfinite subfactors coming from groups.

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