Profinite rigidity of Kähler groups: Riemann surfaces and subdirect products
Fuente:
arXiv
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| Autori principali: | , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866915118228439040 |
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| author | Hughes, Sam Isenrich, Claudio Llosa Py, Pierre Stover, Matthew Vidussi, Stefano |
| author_facet | Hughes, Sam Isenrich, Claudio Llosa Py, Pierre Stover, Matthew Vidussi, Stefano |
| contents | This paper establishes strong profinite rigidity results for Kähler groups, showing that certain groups are determined within the class of residually finite Kähler groups by their profinite completion. Examples include products of surface groups and certain groups with exotic finiteness properties studied earlier by Dimca-Papadima-Suciu and Llosa Isenrich. Consequently, there are aspherical smooth projective varieties that are determined up to homeomorphism by their algebraic fundamental group. The main tool is the following: the holomorphic fibrations of a closed Kähler manifold over hyperbolic 2-orbifolds can be recovered from the profinite completion of its fundamental group. We also prove profinite invariance of the BNS invariant. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_13761 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Profinite rigidity of Kähler groups: Riemann surfaces and subdirect products Hughes, Sam Isenrich, Claudio Llosa Py, Pierre Stover, Matthew Vidussi, Stefano Geometric Topology Algebraic Geometry Group Theory This paper establishes strong profinite rigidity results for Kähler groups, showing that certain groups are determined within the class of residually finite Kähler groups by their profinite completion. Examples include products of surface groups and certain groups with exotic finiteness properties studied earlier by Dimca-Papadima-Suciu and Llosa Isenrich. Consequently, there are aspherical smooth projective varieties that are determined up to homeomorphism by their algebraic fundamental group. The main tool is the following: the holomorphic fibrations of a closed Kähler manifold over hyperbolic 2-orbifolds can be recovered from the profinite completion of its fundamental group. We also prove profinite invariance of the BNS invariant. |
| title | Profinite rigidity of Kähler groups: Riemann surfaces and subdirect products |
| topic | Geometric Topology Algebraic Geometry Group Theory |
| url | https://arxiv.org/abs/2501.13761 |