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What bordism-theoretic anomaly cancellation can do for U

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arxiv 2210.04911 v2 pith:4GRGHZPY submitted 2022-10-10 hep-th math-phmath.ATmath.MP

classification hep-thmath-phmath.ATmath.MP
keywords anomalybordismgroupadamsatiyah-hirzebruchbordism-theoreticcancellationcomputation
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

We perform a bordism computation to show that the $E_{7(7)}(\mathbb{R})$ U-duality symmetry of 4d $\mathcal N = 8$ supergravity could have an anomaly invisible to perturbative methods; then we show that this anomaly is trivial. We compute the relevant bordism group using the Adams and Atiyah-Hirzebruch spectral sequences, and we show the anomaly vanishes by computing $\eta$-invariants on the Wu manifold, which generates the bordism group.

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  1. Cobordism Utopia: U-Dualities, Bordisms, and the Swampland

    hep-th 2025-05 conditional novelty 7.0 of 10

    For 8d maximal supergravity, the spin bordism groups Omega_k^Spin(B(SL(2,Z) x SL(3,Z))) for k=1..7 are computed and each generator is realized by a string/M/F-theory background, some of which are non-geometric.

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