Lorentz-Violating Vector Fields Slow the Universe Down

Details Lorentz-Violating Vector Fields Slow the Universe Down Lorentz-Violating Vector Fields Slow the Universe Down

2004-07-17

arxiv.org/abs/hep-th/0407149v3

Phys.Rev.D70:123525,2004

Physics

High Energy Physics

High Energy Physics - Theory

15 pages, Revtex4, updated version. Added References. Minor Typos corrected. Older version published in PRD

Scientific paper

10.1103/PhysRevD.70.123525

We consider the gravitational effects of a single, fixed-norm, Lorentz-violating timelike vector field. In a cosmological background, such a vector field acts to rescale the effective value of Newton's constant. The energy density of this vector field precisely tracks the energy density of the rest of the universe, but with the opposite sign, so that the universe experiences a slower rate of expansion for a given matter content. This vector field similarly rescales Newton's constant in the Newtonian limit, although by a different factor. We put constraints on the parameters of the theory using the predictions of primordial nucleosynthesis, demonstrating that the norm of the vector field should be less than the Planck scale by an order of magnitude or more.

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