Orthosymplectic Donaldson-Thomas theory
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866913759970197504 |
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| author | Bu, Chenjing |
| author_facet | Bu, Chenjing |
| contents | We construct and study Donaldson-Thomas invariants counting orthogonal and symplectic objects in linear categories, which are a generalization of the usual Donaldson-Thomas invariants from the structure groups $\mathrm{GL} (n)$ to the groups $\mathrm{O} (n)$ and $\mathrm{Sp} (2n)$, and a special case of the intrinsic Donaldson-Thomas theory developed by the author, Halpern-Leistner, Ibáñez Núñez, and Kinjo. Our invariants are defined using the motivic Hall algebra and its orthosymplectic analogue, the motivic Hall module. We prove wall-crossing formulae for our invariants, which relate the invariants with respect to different stability conditions.
As examples, we define Donaldson-Thomas invariants counting orthogonal and symplectic perfect complexes on a Calabi-Yau threefold, and Donaldson-Thomas invariants counting self-dual representations of a self-dual quiver with potential. In the case of quivers, we compute the invariants explicitly in some cases. We also define a motivic version of Vafa-Witten invariants counting orthogonal and symplectic Higgs complexes on a class of algebraic surfaces. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2503_20667 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Orthosymplectic Donaldson-Thomas theory Bu, Chenjing Algebraic Geometry High Energy Physics - Theory We construct and study Donaldson-Thomas invariants counting orthogonal and symplectic objects in linear categories, which are a generalization of the usual Donaldson-Thomas invariants from the structure groups $\mathrm{GL} (n)$ to the groups $\mathrm{O} (n)$ and $\mathrm{Sp} (2n)$, and a special case of the intrinsic Donaldson-Thomas theory developed by the author, Halpern-Leistner, Ibáñez Núñez, and Kinjo. Our invariants are defined using the motivic Hall algebra and its orthosymplectic analogue, the motivic Hall module. We prove wall-crossing formulae for our invariants, which relate the invariants with respect to different stability conditions. As examples, we define Donaldson-Thomas invariants counting orthogonal and symplectic perfect complexes on a Calabi-Yau threefold, and Donaldson-Thomas invariants counting self-dual representations of a self-dual quiver with potential. In the case of quivers, we compute the invariants explicitly in some cases. We also define a motivic version of Vafa-Witten invariants counting orthogonal and symplectic Higgs complexes on a class of algebraic surfaces. |
| title | Orthosymplectic Donaldson-Thomas theory |
| topic | Algebraic Geometry High Energy Physics - Theory |
| url | https://arxiv.org/abs/2503.20667 |