Gauge group topology of 8D Chaudhuri-Hockney-Lykken vacua

Compactifications of the Chaudhuri-Hockney-Lykken (CHL) string to eight dimensions can be characterized by embeddings of root lattices into the rank 12 momentum lattice Lambda(M), the so-called Mikhailov lattice. Based on these data, we devise a method to determine the global gauge group structure including all U(1) 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 pi(1)(G) = 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 rank(G) = 10. Since our method applies also to T-2 compactifications of heterotic strings, we further establish a map that determines any CHL gauge group topology from that of a parent heterotic model.

Automated summary

This passage discusses the compactification of the CHL string to eight dimensions using embeddings of root lattices into the momentum lattice Lambda(M). By this method, the global gauge group structure can be determined, including all U(1) factors. The topology of the gauge group is encoded in the dual of the momentum lattice, with nontrivial pi(1)(G) = Z corresponding to gauging a Z 1-form symmetry.