Ultralimits of Sobolev maps and stability of Dehn functions
Fuente:
arXiv
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| Autori principali: | , |
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| Natura: | Preprint |
| Pubblicazione: |
2026
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| _version_ | 1866915837561012224 |
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| author | Ikonen, Toni Wenger, Stefan |
| author_facet | Ikonen, Toni Wenger, Stefan |
| contents | We show that the ultralimit of a bounded sequence of Lipschitz maps into pointed metric spaces extends naturally to $p$-bounded sequences of Sobolev maps and that this ultralimit for Sobolev maps enjoys desirable properties. We use this to prove the stability of Dehn functions under ultraconvergence of pointed length spaces, thus resolving a problem posed by several researchers in the field. As an application, we obtain a simpler proof of a recent result of Stadler--Wenger, previously proved in the locally compact case by Lytchak--Wenger, characterizing spaces of curvature bounded above by $κ$ via an isoperimetric inequality for curves. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_05246 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Ultralimits of Sobolev maps and stability of Dehn functions Ikonen, Toni Wenger, Stefan Differential Geometry Metric Geometry Primary 53C23, Secondary 46E35, 46E36, 49Q05 We show that the ultralimit of a bounded sequence of Lipschitz maps into pointed metric spaces extends naturally to $p$-bounded sequences of Sobolev maps and that this ultralimit for Sobolev maps enjoys desirable properties. We use this to prove the stability of Dehn functions under ultraconvergence of pointed length spaces, thus resolving a problem posed by several researchers in the field. As an application, we obtain a simpler proof of a recent result of Stadler--Wenger, previously proved in the locally compact case by Lytchak--Wenger, characterizing spaces of curvature bounded above by $κ$ via an isoperimetric inequality for curves. |
| title | Ultralimits of Sobolev maps and stability of Dehn functions |
| topic | Differential Geometry Metric Geometry Primary 53C23, Secondary 46E35, 46E36, 49Q05 |
| url | https://arxiv.org/abs/2603.05246 |