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Nambu-Goldstone Modes in Gravitational Theories with Spontaneous Lorentz Breaking
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Nambu-Goldstone Modes in Gravitational Theories with Spontaneous Lorentz Breaking
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Spontaneous breaking of Lorentz symmetry has been suggested as a possible mechanism that might occur in the context of a fundamental Planck-scale theory, such as string theory or a quantum theory of gravity. However, if Lorentz symmetry is spontaneously broken, two sets of questions immediately arise: what is the fate of the Nambu-Goldstone modes, and can a Higgs mechanism occur? A brief summary of some recent work looking at these questions is presented here.
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