Balogh, Z.M. & Kristály, A. (2026) Advances in Mathematics [Matematică, Q1]

Publicat: 21 Octombrie 2026

Balogh, Z.M. & Kristály, A. (2026) Sharp stability in hypercontractivity estimates and logarithmic Sobolev inequalities. Advances in Mathematics, 505, 111319.

DOI: https://doi.org/10.1016/j.aim.2026.111319

✓ Publisher: Elsevier
✓ Categories: Mathematics
✓ Article Influence Score (AIS): 1,852 (2025) / Q1

Abstract:
We prove stability results in hypercontractivity estimates for the Hopf–Lax semigroup in Rn and apply them to deduce stability results for the Euclidean Lp-logarithmic Sobolev inequality for any p>1. As a main tool, we use recent stability results for the Prékopa–Leindler inequality, due to Böröczky 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 Lp-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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