Determinants on von Neumann algebras, Mahler measures and Ljapunov exponents

Details Determinants on von Neumann algebras, Mahler measures and Ljapunov exponents Determinants on von Neumann algebras, Mahler measures and Ljapunov exponents

2007-12-05

arxiv.org/abs/0712.0667v2

Mathematics

Operator Algebras

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Scientific paper

For an ergodic measure preserving action on a probability space, consider the corresponding crossed product von Neumann algebra. We calculate the Fuglede-Kadison determinant for a class of operators in this von Neumann algebra in terms of the Ljapunov exponents of an associated measurable cocycle. The proof is based on recent work of Dykema and Schultz. As an application one obtains formulas for the Fuglede-Kadison determinant of noncommutative polynomials in the von Neumann algebra of the discrete Heisenberg group. These had been previously obtained by Lind and Schmidt via entropy considerations.

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