Geodesic
Tensor simple spectrum of unitary flows
Funkcionalʹnyj analiz i ego priloženiâ, Tome 56 (2022) no. 4, pp. 113-117.

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Unitary flows $T_t$ of dynamical origin such that, for any countable $Q\subset (0,+\infty)$, the spectrum of the tensor product $\bigotimes_{q\in Q} T_q $ is simple are constructed. All typical flows preserving a sigma-finite measure have this property.
Keywords: unitary flow, weak closure, spectrum, tensor product of operators. 
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V. V. Ryzhikov. Tensor simple spectrum of unitary flows. Funkcionalʹnyj analiz i ego priloženiâ, Tome 56 (2022) no. 4, pp. 113-117. http://geodesic.mathdoc.fr/item/FAA_2022_56_4_a10/

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