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arXiv · 1608.00829

Spontaneous Breaking of Lorentz Symmetry with an antisymmetric tensor

Carlos A. Hernaski
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Abstract

Spontaneous violation of Lorentz symmetry by the vacuum condensation of an antisymmetric $2$-tensor is considered. The coset construction for nonlinear realization of spacetime symmetries is employed to build the most general low-energy effective action for the Goldstone modes interacting with photons. We analyze the model within the context of the Standard-Model Extension and noncommutative QED. Experimental bounds for some parameters of the model are discussed, and we readdress the subtle issues of stability and causality in Lorentz non-invariant scenarios. Besides the two photon polarizations, just one Goldstone mode must be dynamical to set a sensible low-energy effective model, and the enhancement of the stability by accounting interaction terms points to a protection against observational Lorentz violation.

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Carlos A. Hernaski. 2016-07-31. Spontaneous Breaking of Lorentz Symmetry with an antisymmetric tensor. https://doi.org/10.1103/physrevd.94.105004

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