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Statistical anisotropy from vector curvaton in D-brane inflation
Authors:Konstantinos Dimopoulos  Danielle Wills  Ivonne Zavala
Institution:1. Consortium for Fundamental Physics, Physics Department, Lancaster University, Lancaster LA1 4YB, UK;2. Bethe Center for Theoretical Physics and Physikalisches Institut der Universität Bonn, Nußallee 12, D-53115 Bonn, Germany
Abstract:We investigate the possibility of embedding the vector curvaton paradigm in D-brane models of inflation in type IIB string theory in a simple toy model. The vector curvaton is identified with the U(1)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. In this set-up, the vector curvaton is able to generate measurable statistical anisotropy in the spectrum and bispectrum of the curvature perturbation assuming that the dilaton evolves as e−?∝a2e?a2 where a(t)a(t) is the scale factor. Our work constitutes a first step towards exploring how such distinctive features may arise from the presence of several light fields that naturally appear in string theory models of cosmology.
Keywords:Vector curvaton  D-brane inflation  Statistical anisotropy  Non-Gaussianity
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