2025/10/01 by Malliaris, Andreas, Sola, Francisco Marín
#FOS: Mathematics #Functional Analysis (math.FA) #Metric Geometry (math.MG)
paper · doi:10.48550/arxiv.2510.00645
A classical result of Hensley provides a sharp lower bound for the functional ∫_ℝ t2f, where f is a non-negative, even log-concave function. In the context of studying the minimal slabs of the unit cube, Barthe and Koldobsky established a quantitative improvement of Hensley's bound. In this work, we complement their result in several directions. First, we prove the corresponding upper bound inequality for s-concave functions with s≥ 0. Second, we present a generalization of Barthe and Koldobsky's result for functionals of the form ∫_ℝ Nf dμ, where N is a convex, even function and μ belongs to a suitable class of positive Borel measures. As a consequence of the employed methods, we obtain quantitative refinements of classical inequalities for p-norms and for the entropy of log-concave functions. Finally, we discuss both geometric consequences and probabilistic interpretations of our results.