Abstract
We prove the following statement: the set of all essential spectral multiplicities of \(T^{\left( n \right)} = T \times \cdot \cdot \cdot \times T\) (n times) is \(\left\{ {n,\left( {n - 1} \right),...,n!} \right\}\) on \(\left\{ {{\text{const}}} \right\}^ \bot\) for Chacon transformations T, or, equivalently, the operator T(n) has a simple spectrum on the subspace C Sim of all functions that are invariant with respect to permutations of the coordinates. As an immediate consequence of this fact, we have the disjointness of all convolution powers of the spectral measure for Chacon transformations. If n=2, then T× T has a homogeneous spectrum of multiplicity 2 on \(\left\{ {{\text{const}}} \right\}^ \bot\), i.e., this is a solution of Rokhlin's problem for Chacon transformations. Similar statements are considered for other classical automorphisms.
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References
A. del Junco, M. Rahe, and L. Swanson, “Chacon's automorphism has minimal self-joinings,” J. Anal. Math., 37, 276-284 (1980).
K. K. Park and E. A. Robinson Jr., “The joinings within a class of Z2-actions,” J. Anal. Math., 57, 1-36 (1991).
T. Hamachi and C. E. Silva, “On nonsingular Chacon transformations,” Illinois J. Math. (to appear).
A. A. Prihod'ko and V. V. Ryzhikov, “Disjointness of the convolutions for Chacon's transformations,” Colloq. Math. (to appear).
O. N. Ageev, “On ergodic transformations with homogeneous spectrum,” J. Dynamical Cont. Systems, 5, No. 1, 149-152 (1999).
A. B. Katok, “Constructions in ergodic theory,” Unpublished Lecture Notes, 7, 229-248 (1987).
A. del Junco and D. J. Rudolph, “A rank one, rigid, simple, prime map,” Ergodic Theory Dynamical Systems, 7, 229-248 (1987).
I. P. Kornfel_d, Ya. G. Sinai, and S. V. Fomin, Ergodic Theory [in Russian], Nauka, Moscow (1980).
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Ageev, O.N. On the Spectrum of Cartesian Powers of Classical Automorphisms. Mathematical Notes 68, 547–551 (2000). https://doi.org/10.1023/A:1026698921311
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DOI: https://doi.org/10.1023/A:1026698921311