Accelerated expansion and the Goldstone ghost

Details Accelerated expansion and the Goldstone ghost Accelerated expansion and the Goldstone ghost

2004-04-15

arxiv.org/abs/hep-th/0404109v2

JHEP 0407 (2004) 063

Physics

High Energy Physics

High Energy Physics - Theory

12 pages, 2 figures, some improvement in discussion, published version

Scientific paper

10.1088/1126-6708/2004/07/063

A vacuum instability due to a massless ghost in a hidden sector can lead to an effective equation of state for dark energy that changes smoothly from $w=-3/2$ at large redshifts, to $w\approx-1.2$ today, to $w=-1$ in the future. We discuss how this ghost can be the Goldstone boson of Lorentz symmetry breaking, and we find that this breaking in the hidden sector should occur at a scale below $\sim$10 KeV. The normal particles that are produced along with the ghosts are then predominantly neutrinos.

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