Spontaneous Lorentz Violation, Nambu-Goldstone Modes, and Massive Modes

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Abstract
In any theory with spontaneous symmetry breaking, it is important to account for the massless Nambu-Goldstone and massive Higgs modes. In this short review, the fate of these modes is examined for the case of a bumblebee model, in which Lorentz symmetry is spontaneously broken.

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