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Strengthened Fractional Sobolev Type Inequalities in Besov Spaces

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Abstract

The purpose of this article is twofold. The first is to strengthen fractional Sobolev type inequalities in Besov spaces via the classical Lorentz space. In doing so, we show that the Sobolev inequality in Besov spaces is equivalent to the fractional Hardy inequality and the iso-capacitary type inequality. Secondly, we will strengthen fractional Sobolev type inequalities in Besov spaces via capacitary Lorentz spaces associated with Besov capacities. For this purpose, we first study the embedding of the associated capacitary Lorentz space to the classical Lorentz space. Then, the embedding of the Besov space to the capacitary Lorentz space is established. Meanwhile, we show that these embeddings are closely related to the iso-capacitary type inequalities in terms of a new-introduced fractional (β,p,q)-perimeter. Moreover, characterizations of more general Sobolev type inequalities in Besov spaces have also been established.

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Funding

Pengtao Li was supported by National Natural Science Foundation of China (No. 11871293, No. 12071272) and Shandong Natural Science Foundation of China (No. ZR2020MA004).

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Authors and Affiliations

  1. School of Mathematics and Statistics, Qingdao University, Qingdao, Shandong, 266071, China

    Pengtao Li

  2. Department of Mathematics and Statistics, MacEwan University Edmonton, Alberta, T5J2P2, Canada

    Rui Hu & Zhichun Zhai

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  1. Pengtao Li
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  2. Rui Hu
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  3. Zhichun Zhai
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Correspondence to Zhichun Zhai.

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Project supported: Pengtao Li was supported by National Natural Science Foundation of China (No. 11871293, No. 12071272) and Shandong Natural Science Foundation of China (No. ZR2020MA004).

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Li, P., Hu, R. & Zhai, Z. Strengthened Fractional Sobolev Type Inequalities in Besov Spaces. Potential Anal 59, 2105–2121 (2023). https://doi.org/10.1007/s11118-022-10030-z

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  • DOI: https://doi.org/10.1007/s11118-022-10030-z

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