# Energy asymptotics in the three-dimensional Brezis--Nirenberg problem

## TL;DR

This paper analyzes the asymptotic behavior of energy minimizers in a critical Sobolev exponent problem on three-dimensional domains, revealing concentration phenomena and the influence of potential perturbations.

## Contribution

It computes the asymptotics of the Sobolev constant under potential perturbations and characterizes the concentration points of minimizers in the Brezis--Nirenberg problem.

## Key findings

- Minimizers concentrate at points in the zero set of the Robin function.
- Asymptotic expansion of the Sobolev constant as perturbation parameter tends to zero.
- Conditions under which the perturbed Sobolev constant is less than the unperturbed one.

## Abstract

For a bounded open set $\Omega\subset\mathbb R^3$ we consider the minimization problem $$ S(a+\epsilon V) = \inf_{0\not\equiv u\in H^1_0(\Omega)} \frac{\int_\Omega (|\nabla u|^2+ (a+\epsilon V) |u|^2)\,dx}{(\int_\Omega u^6\,dx)^{1/3}} $$ involving the critical Sobolev exponent. The function $a$ is assumed to be critical in the sense of Hebey and Vaugon. Under certain assumptions on $a$ and $V$ we compute the asymptotics of $S(a+\epsilon V)-S$ as $\epsilon\to 0+$, where $S$ is the Sobolev constant. (Almost) minimizers concentrate at a point in the zero set of the Robin function corresponding to $a$ and we determine the location of the concentration point within that set. We also show that our assumptions are almost necessary to have $S(a+\epsilon V)<S$ for all sufficiently small $\epsilon>0$.