Quantitative analysis of optimal Sobolev-Lorentz embeddings with $\alpha$-homogeneous weights

TL;DR

This paper provides a precise quantitative analysis of the non-compactness of optimal weighted Sobolev-Lorentz embeddings with homogeneous weights, revealing their non-uniform structure and calculating key measures of non-compactness.

Contribution

It introduces a new approach to quantify non-compactness in Sobolev-Lorentz embeddings, including exact values of measures like the measure of non-compactness and s-numbers.

Findings

Exact value of the optimal constant in embeddings.

Quantitative structure of non-compactness is characterized.

Embedding is shown not to be strictly singular.

Abstract

Optimal weighted Sobolev-Lorentz embeddings with homogeneous weights in open convex cones are established, with the exact value of the optimal constant. These embeddings are non-compact, and this paper investigates the structure of their non-compactness quantitatively. Opposite to the previous results in this direction, the non-compactness in this case does not occur uniformly over all sub-domains of the underlying domain, and the problem is not translation invariant, and so these properties cannot be exploited here. Nevertheless, by developing a new approach based on a delicate interplay between the size of suitable extremal functions and the size of their supports, the exact values of the (ball) measure of non-compactness and of all injective strict s-numbers (in particular, of the Bernstein numbers) are obtained. Moreover, it is also shown that the embedding is not strictly singular.