Abstract
It is shown by an explicit calculation that the excitations about the self-accelerating cosmological solution of the Dvali-Gabadaze-Porrati model contain a ghost mode. This raises serious doubts about viability of this solution. Our analysis reveals the similarity between the quadratic theory for the perturbations around the self-accelerating universe and an Abelian gauge model with two Stückelberg fields.
- Received 22 December 2005
DOI:https://doi.org/10.1103/PhysRevD.73.044016
©2006 American Physical Society