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• W1987187073 abstract "Strongly continuous semigroups of unital completely positive maps (i.e. quantum Markov semigroups or quantum dynamical semigroups) on compact quantum groups are studied. We show that quantum Markov semigroups on the universal or reduced C${}^*$-algebra of a compact quantum group which are translation invariant (w.r.t. to the coproduct) are in one-to-one correspondence with L'evy processes on its $*$-Hopf algebra. We use the theory of L'evy processes on involutive bialgebras to characterize symmetry properties of the associated quantum Markov semigroup. It turns out that the quantum Markov semigroup is GNS-symmetric (resp. KMS-symmetric) if and only if the generating functional of the L'evy process is invariant under the antipode (resp. the unitary antipode). Furthermore, we study L'evy processes whose marginal states are invariant under the adjoint action. In particular, we give a complete description of generating functionals on the free orthogonal quantum group $O_n^+$ that are invariant under the adjoint action. Finally, some aspects of the potential theory are investigated. We describe how the Dirichlet form and a derivation can be recovered from a quantum Markov semigroup and its L'evy process and we show how, under the assumption of GNS-symmetry and using the associated Schurmann triple, this gives rise to spectral triples. We discuss in details how the above results apply to compact groups, group C$^*$-algebras of countable discrete groups, free orthogonal quantum groups $O_n^+$ and the twisted $SU_q (2)$ quantum group." @default.
• W1987187073 created "2016-06-24" @default.
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• W1987187073 date "2014-03-01" @default.
• W1987187073 modified "2023-10-05" @default.
• W1987187073 title "Symmetries of Lévy processes on compact quantum groups, their Markov semigroups and potential theory" @default.
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• W1987187073 doi "https://doi.org/10.1016/j.jfa.2013.11.026" @default.
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