Ghosts in the self-accelerating DGP branch with Gauss–Bonnet effect
Journal
European Physical Journal C
Journal Volume
75
Journal Issue
6
Date Issued
2015
Author(s)
Liu, Y.-W.
Abstract
The Dvali–Gabadadze–Porrati brane-world model provides a possible approach to address the late-time cosmic acceleration. However, it has subsequently been pointed out that a ghost instability will arise on the self-accelerating branch. Here, we carefully investigate whether this ghost problem could be possibly cured by introducing the Gauss–Bonnet term in the five-dimensional bulk action, a natural generalization to the Dvali–Gabadadze–Porrati model. Our analysis is carried out for a background where a de Sitter brane is embedded in an anti–de Sitter bulk. Our result shows that the ghost excitations cannot be avoided even in this modified model.
Type
journal article