Massless and massive graviton spectra in anisotropic dilatonic braneworld cosmologies

Abstract

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.

18 pages, 4 figures, Typos corrections

References in corpus (5)

• Brane-World Gravity
• Gravitational Field Equations on and off a 3-Brane World
• The spectrum of gravitational waves in Randall-Sundrum braneworld cosmology
• On graviton production in braneworld cosmology
• Relic gravitons on Kasner-like branes

Cited by in corpus (2)

• Bouncing cosmology from Kalb-Ramond Braneworld
• Bulk Antisymmetric tensor fields coupled to a dilaton in a Randall-Sundrum model