{"paper":{"title":"Extra dimensions and the strong CP problem","license":"","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"Archil. B. Kobakhidze, Masud Chaichian","submitted_at":"2001-04-17T10:52:04Z","abstract_excerpt":"In higher-dimensional theories such as Brane World models with quasi-localized non-Abelian gauge fields the vacuum structure turns out to be trivial. Since the gauge theory behaves at large distances as a $4+\\delta$-dimensional and thus the topology of the infinity is that of of $S^{3+\\delta}$ rather than $S^{3}$, the set of gauge mappings are homotopically trivial and the CP-violating $\\theta$-term vanishes on the brane world-volume. As well there are no contributions to the $\\theta$-term from the higher-dimensional solitonic configurations. In this way, the strong CP problem is absent in the"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"hep-ph/0104158","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}