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Ghosts in the self-accelerating DGP branch with Gauss-Bonnet effect

Authors :
Liu, Yen-Wei
Izumi, Keisuke
Bouhmadi-Lopez, Mariam
Chen, Pisin
Source :
Eur.Phys.J. C75 (2015) no.6, 248
Publication Year :
2014

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.<br />Comment: 9 pages, 1 figure. Version improved considerably: one footnote removed with extended discussion in Sec. I, a new paragraph added at the end of Sec. IV and another new paragraph in Sec. V, one figure and some references added

Details

Database :
arXiv
Journal :
Eur.Phys.J. C75 (2015) no.6, 248
Publication Type :
Report
Accession number :
edsarx.1405.0850
Document Type :
Working Paper
Full Text :
https://doi.org/10.1140/epjc/s10052-015-3463-0