Lorentz violation in the linearized gravity

Details Lorentz violation in the linearized gravity Lorentz violation in the linearized gravity

2006-09-29

arxiv.org/abs/hep-th/0609222v4

Phys.Lett.B652:174-180,2007

Physics

High Energy Physics

High Energy Physics - Theory

14 pages, 1 figure, revtex4; v4: final version

Scientific paper

10.1016/j.physletb.2007.07.013

We study some physical consequences of the introduction of a Lorentz-violating modification term in the linearized gravity, which leads to modified dispersion relations for gravitational waves in the vacuum. We discuss two possible mechanisms for the induction of such a term in the Lagrangian. First, it is generated at the quantum level by a Lorentz-breaking coupling of the gravity field to a spinor field. Second, it appears as consequence of a particular modification of the Poisson algebra of the canonical variables, in the spirit of the so-called ``noncommutative fields approach''.

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