A Bourgain-Gromov problem on non-compact Sobolev-Lorentz embeddings
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| Format: | Preprint |
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2025
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| _version_ | 1866913683866648576 |
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| author | Chuah, Chian Yeong Lang, Jan Yao, Liding |
| author_facet | Chuah, Chian Yeong Lang, Jan Yao, Liding |
| contents | We study the non-compact Sobolev embeddings into the optimal scale of Lorentz spaces, $W_0^mL^{p,q}(Ω) \to L^{\frac{dp}{d - mp},r}(Ω)$, where $Ω\subseteq \mathbb{R}^d$, $1 \le m \le d$ and $0<q<r\le\infty$ with $1<p<\frac dm$ or $p=q=1$. We show that these embeddings are finitely strictly singular with certain upper bounds on the decay rate of the Bernstein numbers. We reduce the Sobolev embeddings to embeddings of Besov spaces and sequence spaces, which simplifies the previous methods by Bourgain-Gromov and Lang-Mihula. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2502_05308 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | A Bourgain-Gromov problem on non-compact Sobolev-Lorentz embeddings Chuah, Chian Yeong Lang, Jan Yao, Liding Functional Analysis 47B06 (primary) 46E30 and 46E35 (secondary) We study the non-compact Sobolev embeddings into the optimal scale of Lorentz spaces, $W_0^mL^{p,q}(Ω) \to L^{\frac{dp}{d - mp},r}(Ω)$, where $Ω\subseteq \mathbb{R}^d$, $1 \le m \le d$ and $0<q<r\le\infty$ with $1<p<\frac dm$ or $p=q=1$. We show that these embeddings are finitely strictly singular with certain upper bounds on the decay rate of the Bernstein numbers. We reduce the Sobolev embeddings to embeddings of Besov spaces and sequence spaces, which simplifies the previous methods by Bourgain-Gromov and Lang-Mihula. |
| title | A Bourgain-Gromov problem on non-compact Sobolev-Lorentz embeddings |
| topic | Functional Analysis 47B06 (primary) 46E30 and 46E35 (secondary) |
| url | https://arxiv.org/abs/2502.05308 |