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arxiv: 0909.5639 · v2 · submitted 2009-09-30 · 🧮 math.OA

On spectral gap rigidity and Connes invariant chi(M)

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keywords connesfactorsinvariantspectralanswercalculatecertaininductive
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We calculate Connes' invariant $\chi(M)$ for certain II$_1$ factors $M$ that can be obtained as inductive limits of subfactors with spectral gap, then use this to answer a question he posed in 1975, on the structure of McDuff factors $M$ with $\chi(M)=1$.

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