Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2005-05-25
JHEP0508:001,2005
Physics
High Energy Physics
High Energy Physics - Theory
15 pages, 1 figure, JHEP3.cls; Added references
Scientific paper
10.1088/1126-6708/2005/08/001
We consider a model with Lorentz-violating vector field condensates, in which dispersion laws of all perturbations, including tensor modes, undergo non-trivial modification in the infrared. The model is free of ghosts and tachyons at high 3-momenta. At low 3-momenta there are ghosts, and at even lower 3-momenta there exist tachyons. Still, with appropriate choice of parameters, the model is phenomenologically acceptable. Beyond a certain large distance scale and even larger time scale, the gravity of a static source changes from that of General Relativity to that of van Dam--Veltman--Zakharov limit of the Fierz--Pauli theory. Yet the late time cosmological evolution is always determined by the standard Friedmann equation, modulo small correction to the ``cosmological Planck mass'', so the modification of gravity cannot by itself explain the accelerated expansion of the Universe. We argue that the latter property is generic in a wide class of models with condensates.
Libanov M. V.
Rubakov Valerii A.
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