Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2005-11-18
Phys.Rev. D73 (2006) 044005
Physics
High Energy Physics
High Energy Physics - Theory
10 pages, 5 figures; v2: published version
Scientific paper
10.1103/PhysRevD.73.044005
We study the generation and evolution of gravitational waves (tensor perturbations) in the context of Randall-Sundrum braneworld cosmology. We assume that the initial and final stages of the background cosmological model are given by de Sitter and Minkowski phases, respectively, and they are connected smoothly by a radiation-dominated phase. This setup allows us to discuss the quantum-mechanical generation of the perturbations and to see the final amplitude of the well-defined zero mode. Using the Wronskian formulation, we numerically compute the power spectrum of gravitational waves, and find that the effect of initial vacuum fluctuations in the Kaluza-Klein modes is subdominant, contributing not more than 10% of the total power spectrum. Thus it is confirmed that the damping due to the Kaluza-Klein mode generation and the enhancement due to the modification of the background Friedmann equation are the two dominant effects, but they cancel each other, leading to the same spectral tilt as the standard four-dimensional result. Kaluza-Klein gravitons that escape from the brane contribute to the energy density of the dark radiation at late times. We show that a tiny amount of the dark radiation is generated due to this process.
Kobayashi Tsutomu
Tanaka Takahiro
No associations
LandOfFree
The spectrum of gravitational waves in Randall-Sundrum braneworld cosmology 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 The spectrum of gravitational waves in Randall-Sundrum braneworld cosmology, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The spectrum of gravitational waves in Randall-Sundrum braneworld cosmology will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-710894