Hypercontractivity and the logarithmic Sobolev inequality for the completely bounded norm

Abstract

We develop the notions of hypercontractivity (HC) and the log-Sobolev (LS) inequality for completely bounded norms of one-parameter semigroups of super-operators acting on matrix algebras. We prove the equivalence of the completely bounded versions of HC and LS under suitable hypotheses. We also prove a version of the Gross Lemma which allows LS at general $q$ to be deduced from LS at $q=2$.

27 pages, V3 minor changes

References in corpus (2)

• Hypercontractivity of quasi-free quantum semigroups
• Quantum reverse hypercontractivity

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