The paper traces the global-structure ambiguity of 6d (2,0) theories to non-commuting RR flux boundary conditions in IIB on C^2/Γ, reproducing the known classification of 4d N=4 theories and adding new results on duality defects and Hecke transforms.
Linking forms revisited
1 Pith paper cite this work. Polarity classification is still indexing.
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abstract
We show that the $\mathbb{Q}/\mathbb{Z}$-valued linking forms on rational homology spheres are (anti-) symmetric and we compute the linking form of a 3-dimensional rational homology sphere in terms of a Heegaard splitting. Both results have been known to a larger or lesser degree, but it is difficult to find rigorous down-to-earth proofs in the literature.
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IIB flux non-commutativity and the global structure of field theories
The paper traces the global-structure ambiguity of 6d (2,0) theories to non-commuting RR flux boundary conditions in IIB on C^2/Γ, reproducing the known classification of 4d N=4 theories and adding new results on duality defects and Hecke transforms.