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- W2896576612 abstract "We discuss Donaldson-Thomas (DT) invariants of torsion sheaves with 2 dimensional support on a smooth projective surface in an ambient non-compact Calabi Yau fourfold given by the total space of a rank 2 bundle on the surface. We prove that in certain cases, when the rank 2 bundle is chosen appropriately, the universal truncated Atiyah class of these codimension 2 sheaves reduces to one, defined over the moduli space of such sheaves realized as torsion codimension 1 sheaves in a noncompact divisor (threefold) embedded in the ambient fourfold. Such reduction property of universal Atiyah class enables us to relate our fourfold DT theory to a reduced DT theory of a threefold and subsequently then to the moduli spaces of sheaves on the base surface using results in arXiv:1701.08899 and arXiv:1701.08902 and . We finally make predictions about modularity of such fourfold invariants when the base surface is an elliptic K3." @default.
- W2896576612 created "2018-10-26" @default.
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- W2896576612 date "2018-10-22" @default.
- W2896576612 modified "2023-10-18" @default.
- W2896576612 title "Atiyah class and sheaf counting on local Calabi Yau fourfolds" @default.
- W2896576612 hasPublicationYear "2018" @default.
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