CMB statistical anisotropies of classical and quantum origins
arXiv:1408.2096 · doi:10.1088/1475-7516/2015/04/021
Abstract
We examine the impact of different anisotropic relics on inflation, in particular the predictions on the density perturbations. These relics can be the source of the large scale anomalies in the cosmic microwave background. There are two different types of background relics, one from the matter sector and the other purely from the metric. Although the angular-dependence of the statistical anisotropy in both cases are degenerate, the scale-dependence are observationally distinctive. In addition, we demonstrate that non-Bunch-Davies vacuum states can extend the statistical anisotropy to much shorter scales, and leave a scale-dependence that is insensitive to the different backgrounds but sensitive to the initial quantum state.
16 pages, 3 figures
References in corpus (13)
- Observational Signatures and Non-Gaussianities of General Single Field Inflation
- Inflationary Universe with Anisotropic Hair
- The Uncorrelated Universe: Statistical Anisotropy and the Vanishing Angular Correlation Function in WMAP Years 1-3
- Enhanced Non-Gaussianity from Excited Initial States
- Theory of cosmological perturbations in an anisotropic universe
- The Nature of Primordial Fluctuations from Anisotropic Inflation
- Cosmic Microwave Background Statistics for a Direction-Dependent Primordial Power Spectrum
- Scalar-Scalar, Scalar-Tensor, and Tensor-Tensor Correlators from Anisotropic Inflation
- Inflationary perturbations in anisotropic backgrounds and their imprint on the CMB
- Imprints of anisotropic inflation on the cosmic microwave background
- Anisotropic Inflation from Charged Scalar Fields
- Statistical Anisotropies in Gravitational Waves in Solid Inflation
- On the Initial State and Consistency Relations