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Bordism for the 2-group symmetries of the heterotic and CHL strings

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arxiv 2304.14764 v1 pith:4UQDH6BQ submitted 2023-04-28 math.AT hep-thmath-phmath.MP

classification math.AThep-thmath-phmath.MP
keywords bordismstringgroupgroupssymmetriesheteroticmathrmthen
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

In the presence of a nonzero B-field, the symmetries of the $\mathrm E_8\times \mathrm E_8$ heterotic string form a 2-group, or a categorified group, as do the symmetries of the CHL string. We express the bordism groups of the corresponding tangential structures as twisted string bordism groups, then compute them through dimension 11 modulo a few unresolved ambiguities. Then, we use these bordism groups to study anomalies and defects for these two string theories.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. On Quantum Aspects of 1-Form Symmetries II: Bordism, Invertible Phases, and Anomalies

    hep-th 2026-06 unverdicted novelty 7.0 of 10

    Bordism computation for K(Z,3) identifies a new mixed perturbative anomaly in 5D and a new Z2 discrete anomaly in 7D for U(1) 1-form symmetries.

  2. Non-supersymmetric branes and discrete topological terms

    hep-th 2025-07 conditional novelty 6.0 of 10

    A direct computation from the tentative NS5-brane spectrum gives the opposite Z3 topological term (1/3 vs 2/3) from Tachikawa-Zhang, so the spectrum or the inflow interpretation must change.

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