Primordial statistical anisotropy generated at the end of inflation

2008/05/31 by Shuichiro Yokoyama, Jiro Soda · 5 citations
Physics and Astronomy · #Cosmology and Gravitation Theories #Galaxies: Formation, Evolution, Phenomena #Statistical Mechanics and Entropy #astro-ph #hep-th

paper · pdf · doi:10.1088/1475-7516/2008/08/005

published as JCAP 0808:005,2008 · 9 pages, This version supersedes the JCAP version. Minor revisions

openalex publication_date 2008/08/06 · arxiv created 2011/07/09 · arxiv updated 2011/07/13 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/30

Abstract

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.

Citations

• Examination of Evidence for a Preferred Axis in the Cosmic Radiation Anisotropy
• Testing the cosmological principle of isotropy: local power spectrum estimates of the WMAP data
• Non-Gaussian features of primordial fluctuations in single field inflationary models
• The Axis of Evil revisited
• On the large-angle anomalies of the microwave sky
• A General Analytic Formula for the Spectral Index of the Density Perturbations produced during Inflation
• Super-Horizon Scale Dynamics of Multi-Scalar Inflation
• Supergravity inspired vector curvaton

Cited by

• Parti sans laisser d'adresse
• Anisotropic Bispectrum of Curvature Perturbations from Primordial Non-Abelian Vector Fields
• Statistical anisotropy of the curvature perturbation from vector field perturbations
• P-nflation: generating cosmic Inflation with p-forms
• Simple types of anisotropic inflation
• Aether unleashed