Ghosts in the self-accelerating universe

Details Ghosts in the self-accelerating universe Ghosts in the self-accelerating universe

2007-09-15

arxiv.org/abs/0709.2399v2

Class.Quant.Grav.24:R231-R253,2007

Physics

High Energy Physics

High Energy Physics - Theory

Invited topical review for Classical and Quantum Gravity, 20 pages, 4 figures

Scientific paper

10.1088/0264-9381/24/24/R01

The self-accelerating universe realizes the accelerated expansion of the universe at late times by large-distance modification of general relativity without a cosmological constant. The Dvali-Gabadadze-Porrati (DGP) braneworld model provides an explicit example of the self-accelerating universe. Recently, the DGP model becomes very popular to study the observational consequences of the modified gravity models as an alternative to dark energy models in GR. However, it has been shown that the self-accelerating universe in the DGP model contains a ghost at the linearized level. The ghost carries negative energy densities and it leads to the instability of the spacetime. In this article, we review the origin of the ghost in the self-accelerating universe and explore the physical implication of the existence of the ghost.

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