Primordial statistical anisotropy generated at the end of inflation

@article{Yokoyama2008PrimordialSA,
  title={Primordial statistical anisotropy generated at the end of inflation},
  author={Shuichiro Yokoyama and J. Soda},
  journal={Journal of Cosmology and Astroparticle Physics},
  year={2008},
  volume={2008},
  pages={005}
}
We present a new mechanism for generating primordial statistical anisotropy of curvature perturbations. We introduce a vector field which has a non-minimal kinetic term and couples with a waterfall field in a hybrid inflation model. In such a system, the vector field gives fluctuations of the end of inflation and hence induces a subcomponent of curvature perturbations. Since the vector has a preferred direction, the statistical anisotropy could appear in the fluctuations. We present the… 
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