Statistical Anisotropy from Vector Curvaton in D-brane Inflation

Details Statistical Anisotropy from Vector Curvaton in D-brane Inflation Statistical Anisotropy from Vector Curvaton in D-brane Inflation

2011-08-22

arxiv.org/abs/1108.4424v2

Physics

High Energy Physics

High Energy Physics - Theory

41 pages, 2 figures. Typos corrected, references added, minor changes

Scientific paper

We discuss an explicit realisation of the vector curvaton paradigm in D-brane models of inflation in Type IIB string theory. The vector curvaton is identified with the U(1) gauge field that lives on the world volume of a D3-brane, which may be stationary or undergoing general motion in the internal space. The dilaton is considered as a spectator field which modulates the evolution of the vector field. We demonstrate that the vector curvaton is able to generate measurable statistical anisotropy in the spectrum and bispectrum of the curvature perturbation as long as the dilaton evolves as e^(-phi)\propto a^2, where a(t) is the scale factor.

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