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The Kneser–Poulsen Phenomena for Entropy
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Abstract
The Kneser–Poulsen conjecture asserts that the volume of a union of balls in Euclidean space cannot be increased by bringing their centres pairwise closer. We prove that its natural information-theoretic counterpart is true. This follows from a complete answer to a question asked in [1] about Gaussian convolutions, namely that the Rényi entropy comparisons between a probability measure and its contractive image are preserved when both undergo simultaneous heat flow. An inequality that unifies Costa’s result on the concavity of entropy power with the entropic Kneser–Poulsen theorem is also presented.
Oxford University Press (OUP)
Title: The Kneser–Poulsen Phenomena for Entropy
Description:
Abstract
The Kneser–Poulsen conjecture asserts that the volume of a union of balls in Euclidean space cannot be increased by bringing their centres pairwise closer.
We prove that its natural information-theoretic counterpart is true.
This follows from a complete answer to a question asked in [1] about Gaussian convolutions, namely that the Rényi entropy comparisons between a probability measure and its contractive image are preserved when both undergo simultaneous heat flow.
An inequality that unifies Costa’s result on the concavity of entropy power with the entropic Kneser–Poulsen theorem is also presented.
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