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 Vector models of gravitational Lorentz symmetry breaking


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Spontaneous Lorentz symmetry breaking can occur when the dynamics of a tensor field cause it to take on a non-zero expectation value in vacuo, thereby providing one or more -preferred directions- in spacetime. Couplings between such fields and spacetime curvature will then affect the dynamics of the metric, leading to interesting gravitational effects. Bailey & Kostelecky developed a post-Newtonian formalism that, under certain conditions concerning the fields couplings and stress-energy, allows for the analysis of gravitational effects in the presence of Lorentz symmetry breaking. We perform a systematic survey of vector models of spontaneous Lorentz symmetry breaking. We find that a two-parameter class of vector models, those with kinetic terms we call -pseudo-Maxwell,- can be successfully analyzed under the Bailey-Kostelecky formalism, and that one of these two -dimensions- in parameter space has not yet been explored as a possible mechanism of spontaneous Lorentz symmetry breaking.



Author: Michael D. Seifert

Source: https://archive.org/







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