Massless and massive graviton spectra in anisotropic dilatonic braneworld cosmologies

Details Massless and massive graviton spectra in anisotropic dilatonic braneworld cosmologies Massless and massive graviton spectra in anisotropic dilatonic braneworld cosmologies

2006-01-30

arxiv.org/abs/gr-qc/0601132v3

Phys.Rev. D73 (2006) 124015

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

18 pages, 4 figures, Typos corrections

Scientific paper

10.1103/PhysRevD.73.124015

We consider a braneworld model in which an anisotropic brane is embedded in a dilatonic background. We solve the background solutions and study the behavior of the perturbations when the universe evolves from an inflationary Kasner phase to a Minkowski phase. We calculate the massless mode spectrum, and find that it does not differ from what expected in standard four-dimensional cosmological models. We then evaluate the spectrum of both light (ultrarelativistic) and heavy (nonrelativistic) massive modes, and find that, at high energies, there can be a strong enhancement of the Kaluza-Klein spectral amplitude, which can become dominant in the total spectrum. The presence of the dilaton, on the contrary, decrease the relative importance of the massive modes.

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