Generalized Sublevel Estimates for Form-Valued Functions and Related Results for Radon-like Transforms

TL;DR

This paper develops local conditions for smooth maps to ensure uniform integrability of inverse norms, extending sublevel set bounds to higher dimensions and applying geometric invariant theory to Radon-like transforms.

Contribution

It introduces new local criteria for uniform integrability of form-valued functions and characterizes Radon-like transforms via curvature semistability, advancing the understanding of these transforms.

Findings

Established local conditions for uniform integrability of inverse norms.

Provided a new characterization of Radon-like transforms using curvature semistability.

Extended sublevel set bounds to higher-dimensional form-valued functions.

Abstract

Motivated by the testing condition for Radon-Brascamp-Lieb multilinear functionals established in arXiv:2201.12201, this paper is concerned with identifying local conditions on smooth maps $u(t)$ with values in the space of decomposable p-forms on some real vector space V which guarantee uniform integrability of $||u(t)||^{-\tau}$ over a certain natural, noncompact family of norms. One can loosely regard this problem as a higher-dimensional analogue of establishing uniform bounds for the size of a sublevel set of a function in terms of the size of its derivatives. The resulting theorem relies extensively on ideas from Geometric Invariant Theory to understand what appropriate derivative bounds look like in this context. Several examples and applications are presented, including a new local characterization of so-called "model" Radon-like transforms in terms of the semistability of a natural curvature functional (giving an equivalent but rather different criterion than the one first established in arXiv:2303.03325).