Rényi–Sobolev Inequalities and Connections to Spectral Graph Theory

06/21/2023

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by   Lei Yu, et al.

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In this paper, we generalize the log-Sobolev inequalities to Rényi–Sobolev inequalities by replacing the entropy with the two-parameter entropy, which is a generalized version of entropy closely related to Rényi divergences. We derive the sharp nonlinear dimension-free version of this kind of inequalities. Interestingly, the resultant inequalities show a phase transition depending on the parameters. We then connect Rényi–Sobolev inequalities to the spectral graph theory. Our proofs in this paper are based on the information-theoretic characterization of the Rényi–Sobolev inequalities, as well as the method of types.