Abstract
The discovery of neutrino masses has provided strong hints in favor of the possibility that B–L symmetry is an intimate feature of physics beyond the standard model. I discuss how important information about this symmetry as well as other scenarios for TeV scale new physics can be obtained from the baryon number violating process, n– oscillation. This paper presents an overview of different aspects of neutron–anti-neutron oscillation and is divided into the following parts: (i) the phenomenon, (ii) the physics, (iii) plausible models and (iv) applications to cosmology. In particular, it is argued how the discovery of n– oscillation can significantly affect our thinking about simple grand unified theory paradigms for physics beyond the standard model, elucidate the nature of forces behind neutrino mass and provide a new microphysical view of the origin of matter in the universe.
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