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VOLUME 94 | ISSUE 9 | PAGE 731
Superluminal neutrino and spontaneous breaking of Lorentz invariance
F. R. Klinkhamer, G. E. Volovik^*°.

+Institute for Theoretical Physics, University of Karlsruhe, Karlsruhe Institute of Technology, 76128 Karlsruhe, Germany
*Low Temperature Laboratory, Aalto University, FI-00076 AALTO, Finland
°Landau Institute for Theoretical Physics, Russian Academy of Sciences, 142432 Chernogolovka, Russia

Generally speaking, the existence of a superluminal neutrino can be attributed either to re-entrant Lorentz violation at ultralow energy from intrinsic Lorentz violation at ultrahigh energy or to spontaneous breaking of fundamental Lorentz invariance (possibly by the formation of a fermionic condensate). Re-entrant Lorentz violation in the neutrino sector has been discussed elsewhere. Here, the focus is on mechanisms of spontaneous symmetry breaking.

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