Compactifying the rank two Hitchin system via spectral data on semistable curves
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arXiv
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| Auteurs principaux: | , |
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| Format: | Preprint |
| Publié: |
2022
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| _version_ | 1866911752670674944 |
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| author | Horn, Johannes Möller, Martin |
| author_facet | Horn, Johannes Möller, Martin |
| contents | We study resolutions of the rational map to the moduli space of stable curves that associates with a point in the Hitchin base the spectral curve. In the rank two case the answer is given in terms of the space of quadratic multi-scale differentials introduced in [BCGGM3]. This space defines a compactification (of the projectivization) of the regular locus of the $\mathrm{GL}(2,\mathbb{C})$-Hitchin base and provides a compactification of the Hitchin system by compactified Jacobians of pointed stable curves. We show how the classical $\mathrm{GL}(2,\mathbb{C})$- and $\mathrm{SL}(2,\mathbb{C})$-spectral correspondence extend to the compactified Hitchin system by a correspondence along an admissible cover between torsion-free rank $1$ sheaves and (multi-scale) Higgs pairs of rank $2$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2201_08104 |
| institution | arXiv |
| publishDate | 2022 |
| record_format | arxiv |
| spellingShingle | Compactifying the rank two Hitchin system via spectral data on semistable curves Horn, Johannes Möller, Martin Algebraic Geometry We study resolutions of the rational map to the moduli space of stable curves that associates with a point in the Hitchin base the spectral curve. In the rank two case the answer is given in terms of the space of quadratic multi-scale differentials introduced in [BCGGM3]. This space defines a compactification (of the projectivization) of the regular locus of the $\mathrm{GL}(2,\mathbb{C})$-Hitchin base and provides a compactification of the Hitchin system by compactified Jacobians of pointed stable curves. We show how the classical $\mathrm{GL}(2,\mathbb{C})$- and $\mathrm{SL}(2,\mathbb{C})$-spectral correspondence extend to the compactified Hitchin system by a correspondence along an admissible cover between torsion-free rank $1$ sheaves and (multi-scale) Higgs pairs of rank $2$. |
| title | Compactifying the rank two Hitchin system via spectral data on semistable curves |
| topic | Algebraic Geometry |
| url | https://arxiv.org/abs/2201.08104 |