Nontrivial spacetime topology, CPT violation, and photons
Abstract
Description
A physical mechanism for CPT violation is reviewed, which relies on chiral fermions, gauge interactions, and nontrivial spacetime topology. The nontrivial topology can occur at the very largest scale (e.g., at the "edge" of the universe) or at the very smallest scale (e.g., from a hypothetical spacetime foam). The anomalous effective gauge field action includes, most likely, a CPT-odd Chern-Simons-like term. Two phenomenological photon models with Abelian Chern-Simons-like terms are discussed.
36 pages; invited talk at CP Violation and the Flavour Puzzle: Symposium in Honour of Gustavo C. Branco, Lisbon, July, 2005; v5: published version, updated references
36 pages; invited talk at CP Violation and the Flavour Puzzle: Symposium in Honour of Gustavo C. Branco, Lisbon, July, 2005; v5: published version, updated references