Statistical anisotropy from vector curvaton in D-brane inflation
Statistical anisotropy from vector curvaton in D-brane inflation
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D 膜膨胀中矢量曲率的统计各向异性
DOI:
10.1016/j.nuclphysb.2012.11.010
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发表时间:
2013
影响因子:
2.8
通讯作者:
Dimopoulos K
中科院分区:
文献类型:
--
作者:
Dimopoulos K
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) 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−ϕ∝a2where 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.
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