Monday, 20 July 2015

quantum field theory - Spontaneous breaking of Lorentz invariance


Is it possible to spontaneously break Lorentz invariance, i.e., have a Lagrangian that respects LI but a vacuum which does not? If it is possible, why isn't there even the slightest hint of the Minkowski vacuum not being Lorentz invariant? (Or in other words, would this pose another fine-tuning problem?)




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