Gauge group topology of 8D Chaudhuri-Hockney-Lykken vacuaCvetič, Mirjam (Avtor) Dierigl, Markus (Avtor) Lin, Ling (Avtor) Zhang, Hao Y. (Avtor) astrophysicscompactificationstring dualitiesstring and branesdiscrete symmetriessymmetriesgauge symmetriesCompactifications of the Chaudhuri-Hockney-Lykken (CHL) string to eight dimensions can be characterized by embeddings of root lattices into the rank 12 momentum lattice ΛM, the so-called Mikhailov lattice. Based on these data, we devise a method to determine the global gauge group structure including all Uð1Þ factors. The key observation is that, while the physical states correspond to vectors in the momentum lattice, the gauge group topology is encoded in its dual. Interpreting a nontrivial π1ðGÞ ≡ Z for the non-Abelian gauge group G as having gauged a Z 1-form symmetry, we also prove that all CHL gauge groups are free of a certain anomaly [1] that would obstruct this gauging. We verify this by explicitly computing Z for all 8D CHL vacua with rankðGÞ ¼ 10. Since our method applies also to T2 compactifications of heterotic strings, we further establish a map that determines any CHL gauge group topology from that of a “parent” heterotic model.American Physical Society20212023-10-13 15:03:22Znanstveno delo86155UDK: 52COBISS_ID: 97890307ISSN pri članku: 2470-0029sl