Ultra-large distance modification of gravity from Lorentz symmetry breaking at the Planck scale

Details Ultra-large distance modification of gravity from Lorentz symmetry breaking at the Planck scale Ultra-large distance modification of gravity from Lorentz symmetry breaking at the Planck scale

2005-06-08

arxiv.org/abs/hep-th/0506067v1

JHEP 0509 (2005) 082

Physics

High Energy Physics

High Energy Physics - Theory

28 pages

Scientific paper

10.1088/1126-6708/2005/09/082

We present an extension of the Randall--Sundrum model in which, due to spontaneous Lorentz symmetry breaking, graviton mixes with bulk vector fields and becomes quasilocalized. The masses of KK modes comprising the four-dimensional graviton are naturally exponentially small. This allows to push the Lorentz breaking scale to as high as a few tenth of the Planck mass. The model does not contain ghosts or tachyons and does not exhibit the van Dam--Veltman--Zakharov discontinuity. The gravitational attraction between static point masses becomes gradually weaker with increasing of separation and gets replaced by repulsion (antigravity) at exponentially large distances.

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