$L^2$-stability for the variance Brascamp-Lieb inequality

Abstract

We prove an $L^2$-stability estimate for the variance Brascamp-Lieb inequality [J. Funct. Anal. 22 (4), 366-389 (1976)] by bootstrapping the recent $L^1$-stability theorem of Machado and Ramos [arXiv:2511.22636] under an additional assumption, which we call the super-Brascamp-Lieb inequality, of independent interest.

15 pages, some changes made according to referee recommendations, to appear in Proc. Amer. Math. Soc