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arXiv math/0008127math.OA
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自由积自同构的拓扑熵

Topological Entropy of Free Product Automorphisms

N. P. Brown, K. Dykema, D. Shlyakhtenko

摘要:

利用Cuntz-Pimsner C* 代数的自由概率构造,证明了两个自同构的自由积的拓扑熵等于其各自熵的最大值.作为应用,我们证明了一般自由位移的熵为零。我们证明了任何核C*-动力系统都允许在无穷多个生成元上的Cuntz代数中嵌入一个保熵协变。由此得出,任何简单的核纯无限C* 代数-代数允许具有任何给定熵值的自同构。作为最后的应用,我们表明,如果两个自同构满足CNT-变分原理,那么他们的自由积。

英文摘要:

Using free probability constructions involving Cuntz-Pimsner C*-algebras we show that the topological entropy of the free product of two automorphisms is equal to the maximum of the individual entropies. As applications we show that general free shifts have entropy zero. We show that any nuclear C*-dynamical system admits an entropy preserving covariant embedding into the Cuntz algebra on infinitely many generators. It follows that any simple nuclear purely infinite C*-algebra admits an automorphism with any given value of entropy. As a final application we show that if two automorphisms satisfy a CNT-variational principle then so does their free product.

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