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Sharp stability in hypercontractivity estimates and logarithmic Sobolev inequalities
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abstract
We prove stability results in hypercontractivity estimates for the Hopf--Lax semigroup in $\mathbb R^n$ and apply them to deduce stability results for the Euclidean $L^p$-logarithmic Sobolev inequality for any $p>1$. As a main tool, we use recent stability results for the Pr\'ekopa--Leindler inequality, due to B\"or\"oczky and De (2021), Figalli and Ramos (2024) and Figalli, van Hintum, and Tiba (2025). Under mild assumptions on the functions, most of our stability results turn out to be sharp, as they are reflected in the optimal exponent $1/2$ both in the hypercontractivity and $L^p$-logarithmic Sobolev deficits, respectively. This approach also works for establishing stability of Gaussian hypercontractivity estimates and Gaussian logarithmic Sobolev inequality, respectively.
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Quantitative stability for the Brascamp-Lieb inequality and moment measures
For any convex potential, the L1 distance from a function to the Brascamp-Lieb optimizer manifold is controlled by the square root of its deficit, with a dimension-only constant independent of the potential.
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