Resumen: Based on Koopman formalism for classical statistical mechanics, we propose a formalism to define hybrid quantum–classical dynamical systems by defining (outer) automorphisms of the $C^*$ algebra of hybrid operators and realizing them as linear transformations on the space of hybrid states. These hybrid states are represented as density matrices on the Hilbert space obtained from the hybrid $C^*$–algebra by the GNS construction. We also classify all possible dynamical systems which are unitary and obtain the possible hybrid Hamiltonian operators. Idioma: Inglés DOI: 10.1088/1751-8121/aceed5 Año: 2023 Publicado en: Journal of Physics A-Mathematical and Theoretical 56, 37 (2023), 374001 [21 pp.] ISSN: 1751-8113 Factor impacto JCR: 2.0 (2023) Categ. JCR: PHYSICS, MULTIDISCIPLINARY rank: 47 / 110 = 0.427 (2023) - Q2 - T2 Categ. JCR: PHYSICS, MATHEMATICAL rank: 18 / 60 = 0.3 (2023) - Q2 - T1 Factor impacto CITESCORE: 4.1 - Statistics and Probability (Q1) - Mathematical Physics (Q1) - Statistical and Nonlinear Physics (Q2) - Physics and Astronomy (all) (Q2) - Modeling and Simulation (Q2)