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Main Authors: Su, Weicong, Wang, Zhuang, Zhang, Yi Ru-Ya
Format: Preprint
Published: 2026
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Online Access:https://arxiv.org/abs/2604.20600
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author Su, Weicong
Wang, Zhuang
Zhang, Yi Ru-Ya
author_facet Su, Weicong
Wang, Zhuang
Zhang, Yi Ru-Ya
contents We investigate the geometric behavior of $τ(E)$ for bounded finite-perimeter sets $E \subset \mathbb R^n$, where $τ(E)$ is the trace constant introduced by Figalli--Maggi--Pratelli [Invent. Math. 2010]. This quantity is a key ingredient in proving a quantitative isoperimetric inequality with the optimal exponent. We first show that for every $ε>0$ one can find a bounded open set $Ω\subset \mathbb R^n$ that is very close to the unit ball $\mathbb B^n$ in the sense that $$ τ(\mathbb B^n)>τ(Ω)>τ(\mathbb B^n)-ε\quad \text{and} \quad P(ΩΔ\mathbb B^n)\le C(n)ε, $$ while at the same time the complement of $Ω$ has infinitely many connected components. Thus, $τ(Ω)$ can be made arbitrarily close to $τ(\mathbb B^n)$ even when $Ω$ has highly intricate geometry. We then establish, under a mild additional hypothesis, the equivalence between a condition formulated in terms of $τ$ and two classical criteria from the literature for open sets that admit trace inequalities. As a consequence, we obtain the John-type characterization of domains that support a trace inequality, assuming the ball separation property.
format Preprint
id arxiv_https___arxiv_org_abs_2604_20600
institution arXiv
publishDate 2026
record_format arxiv
spellingShingle Geometric properties of Euclidean domains supporting trace inequalities
Su, Weicong
Wang, Zhuang
Zhang, Yi Ru-Ya
Functional Analysis
46E35
We investigate the geometric behavior of $τ(E)$ for bounded finite-perimeter sets $E \subset \mathbb R^n$, where $τ(E)$ is the trace constant introduced by Figalli--Maggi--Pratelli [Invent. Math. 2010]. This quantity is a key ingredient in proving a quantitative isoperimetric inequality with the optimal exponent. We first show that for every $ε>0$ one can find a bounded open set $Ω\subset \mathbb R^n$ that is very close to the unit ball $\mathbb B^n$ in the sense that $$ τ(\mathbb B^n)>τ(Ω)>τ(\mathbb B^n)-ε\quad \text{and} \quad P(ΩΔ\mathbb B^n)\le C(n)ε, $$ while at the same time the complement of $Ω$ has infinitely many connected components. Thus, $τ(Ω)$ can be made arbitrarily close to $τ(\mathbb B^n)$ even when $Ω$ has highly intricate geometry. We then establish, under a mild additional hypothesis, the equivalence between a condition formulated in terms of $τ$ and two classical criteria from the literature for open sets that admit trace inequalities. As a consequence, we obtain the John-type characterization of domains that support a trace inequality, assuming the ball separation property.
title Geometric properties of Euclidean domains supporting trace inequalities
topic Functional Analysis
46E35
url https://arxiv.org/abs/2604.20600