Wall-crossing and orientations for invariants counting coherent sheaves on CY fourfolds
<p>Borisov–Joyce and Oh–Thomas defined virtual invariants counting sheaves on Calabi–Yau fourfolds. Similarly to Donaldson invariants, these depend on existence and choice of orientations on moduli spaces of coherent sheaves. The first part of the thesis addresses this question for quasi-proje...
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| Materialtyp: | Lärdomsprov |
| Språk: | English |
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2021
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