Primordial statistical anisotropy generated at the end of inflation
By Shuichiro Yokoyama, Jiro Soda. 2008
196 citations recorded by the source corpus.
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 explicit formula for the statistical anisotropy in the primordial power spectrum and the bispectrum of curvature perturbations. Interestingly, there is the possibility that the statistical anisotropy does not appear in the power spectrum but does appear in the bispectrum. We also find that the statistical anisotropy provides the shape dependence to the bispectrum.
Subfields: Astronomy and Astrophysics, Statistical and Nonlinear Physics
View Paper: https://www.semanticscholar.org/paper/266be9888a20ac2a3056fb399ecd13397a89dc0d
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In Astronomy and Astrophysics
In Statistical and Nonlinear Physics
Citations in the corpus
- Gauge fields and inflation (2012, methodology): “There are many works on primordial magnetic fields from inflation [55, 56, 57, 58, 59, 60, 61, 62, 63], although there exists no convincing model so far.”
- Observable non-gaussianity from gauge field production in slow roll inflation, and a challenging connection with magnetogenesis (2012, background): “[34] studied non-gaussianity from a gauge field amplified analogously to what we do here, but imprinted through the waterfall field of hybrid inflaton [35].”