MG13 - Talk detail

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An overview of the theoretical issues and phenomenology of spontaneous Lorentz violation will be presented. Spontaneous Lorentz violation occurs when a vector or tensor field acquires a nonzero vacuum expectation value. In recent years, a comprehensive investigation of the theory and phenomenology of Lorentz violation has been carried out. Both explicit and spontaneous breaking of Lorentz symmetry have been examined. In the case of spontaneous Lorentz violation, effects include an associated spontaneous breaking of diffeomorphism symmetry and generation of both massless Nambu-Goldstone modes and massive modes in an alternative form of the Higgs mechanism, leading to possible modifications of gravity. The phenomenology of Lorentz violation is examined using the Standard-Model Extension. It provides a general theoretical framework at the level of effective field theory.

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