Absence of algebraic relations and of zero divisors under the assumption of full non-microstates free entropy dimension

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• 作者：Tobias Mai ; ^{mai@math.uni-sb.de" class="auth_mail" title="E-mail the corresponding author} ; Roland Speicher ^{speicher@math.uni-sb.de" class="auth_mail" title="E-mail the corresponding author} ; Moritz Weber ^{weber@math.uni-sb.de" class="auth_mail" title="E-mail the corresponding author}
• 关键词：46L54 ; 60B20
• 刊名：Advances in Mathematics
• 出版年：2017
• 出版时间：2 January 2017
• 年：2017
• 卷：304
• 期：Complete
• 页码：1080-1107
• 全文大小：473 K

文摘

We show that in a tracial and finitely generated W^⁎iner hidden">$W^{⁎}$-probability space existence of conjugate variables excludes algebraic relations for the generators. Moreover, under the assumption of maximal non-microstates free entropy dimension, we prove that there are no zero divisors in the sense that the product of any non-commutative polynomial in the generators with any element from the von Neumann algebra is zero if and only if at least one of those factors is zero. In particular, this shows that in this case the distribution of any non-constant self-adjoint non-commutative polynomial in the generators does not have atoms.

Questions on the absence of atoms for polynomials in non-commuting random variables (or for polynomials in random matrices) have been an open problem for quite a while. We solve this general problem by showing that maximality of free entropy dimension excludes atoms.