Braneworld Flux Inflation

Details Braneworld Flux Inflation Braneworld Flux Inflation

2005-06-21

arxiv.org/abs/hep-th/0506167v2

JCAP 0508 (2005) 002

Physics

High Energy Physics

High Energy Physics - Theory

11 pages, 6 figures, references added

Scientific paper

10.1088/1475-7516/2005/08/002

We propose a geometrical model of brane inflation where inflation is driven by the flux generated by opposing brane charges and terminated by the collision of the branes, with charge annihilation. We assume the collision process is completely inelastic and the kinetic energy is transformed into the thermal energy after collision. Thereafter the two branes coalesce together and behave as a single brane universe with zero effective cosmological constant. In the Einstein frame, the 4-dimensional effective theory changes abruptly at the collision point. Therefore, our inflationary model is necessarily 5-dimensional in nature. As the collision process has no singularity in 5-dimensional gravity, we can follow the evolution of fluctuations during the whole history of the universe. It turns out that the radion field fluctuations have a steeply tilted, red spectrum, while the primordial gravitational waves have a flat spectrum. Instead, primordial density perturbations could be generated by a curvaton mechanism.

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