Sharp Fractional Sobolev Embeddings on Closed Manifolds
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arXiv
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| Hauptverfasser: | , , |
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| Format: | Preprint |
| Veröffentlicht: |
2025
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| _version_ | 1866917160740192256 |
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| author | Tan, Hao Yan, Zetian Yang, Zhipeng |
| author_facet | Tan, Hao Yan, Zetian Yang, Zhipeng |
| contents | We develop an intrinsic, heat-kernel based fractional Sobolev framework on closed Riemannian manifolds and study the critical fractional Sobolev embedding. We determine the optimal coefficient of the lower-order $L^{p}$ term and prove that the fully sharp $p$-power inequality cannot hold globally in the superquadratic range. We further establish an almost sharp inequality whose leading constant is arbitrarily close to the Euclidean best constant, and we derive improved inequalities under finitely many orthogonality constraints with respect to sign-changing test families. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_18770 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Sharp Fractional Sobolev Embeddings on Closed Manifolds Tan, Hao Yan, Zetian Yang, Zhipeng Analysis of PDEs Differential Geometry 35R01, 35R11, 35A15 We develop an intrinsic, heat-kernel based fractional Sobolev framework on closed Riemannian manifolds and study the critical fractional Sobolev embedding. We determine the optimal coefficient of the lower-order $L^{p}$ term and prove that the fully sharp $p$-power inequality cannot hold globally in the superquadratic range. We further establish an almost sharp inequality whose leading constant is arbitrarily close to the Euclidean best constant, and we derive improved inequalities under finitely many orthogonality constraints with respect to sign-changing test families. |
| title | Sharp Fractional Sobolev Embeddings on Closed Manifolds |
| topic | Analysis of PDEs Differential Geometry 35R01, 35R11, 35A15 |
| url | https://arxiv.org/abs/2512.18770 |