Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2008-12-16
Physics
High Energy Physics
High Energy Physics - Theory
Reference added
Scientific paper
10.1016/j.physletb.2009.03.044
We investigate the Dvali-Gabadadze-Porrati (DGP) model corrected by higher curvature brane terms. We show that these corrections have a dramatic impact on the spectrum of the model at the linearized level. Owing to the presence of higher derivatives in the field equations very massive ghost excitations with mass of order of Planck mass are generated in the ordinary branch of the model. These excitations describe an instability of Minkowski vacuum with time-scale of order of the Hubble time. At large distances these tachyonic excitations are expected to decouple from brane-localized matter. Our modified DGP model represents therefore a very promising framework for solving of the cosmological constant problem, in which Planck-scale physics is responsible for the elementary excitations driving the accelerated expansion of the universe, but the time-scale of the instability is settled by gravitational physics at large scales.
Cadoni Mariano
Pani Paolo
No associations
LandOfFree
Higher Curvature Brane Corrections to the DGP Model does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Higher Curvature Brane Corrections to the DGP Model, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Higher Curvature Brane Corrections to the DGP Model will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-226995