Lorentz-Violating Massive Gravity in Curved Space

Details Lorentz-Violating Massive Gravity in Curved Space Lorentz-Violating Massive Gravity in Curved Space

2008-03-07

arxiv.org/abs/0803.1137v3

JHEP0811:023,2008

Physics

High Energy Physics

High Energy Physics - Theory

23 pages, 9 figures; corrected typos and added references; JHEP version, corrected one mistake, few typos and added references

Scientific paper

10.1088/1126-6708/2008/11/023

In models of modified gravity, extra degrees of freedom usually appear. They must be removed from the spectrum because they may indicate the presence of instabilities and because otherwise the model might not agree with observation. In the present letter, we will discuss a model that modifies General Relativity through the addition of a Lorentz-violating potential-like term for the metric. No additional propagating modes and no classical instabilities are present. The model departs from GR only in the extreme infrared region, and the cosmological evolution contains a bounce when the size of the Universe is of the same order of the added deformation.

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