More on ghosts in the Dvali-Gabadaze-Porrati model
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.
- Publication:
-
Physical Review D
- Pub Date:
- February 2006
- DOI:
- 10.1103/PhysRevD.73.044016
- arXiv:
- arXiv:hep-th/0512097
- Bibcode:
- 2006PhRvD..73d4016G
- Keywords:
-
- 04.50.+h;
- 11.10.Ef;
- Gravity in more than four dimensions Kaluza-Klein theory unified field theories;
- alternative theories of gravity;
- Lagrangian and Hamiltonian approach;
- High Energy Physics - Theory;
- Astrophysics;
- General Relativity and Quantum Cosmology
- E-Print:
- Revtex, 9 pages, no figures