Non-isotropy in the CMB power spectrum in single field inflation
arXiv:astro-ph/0703455 · doi:10.1103/PhysRevD.80.023526
Abstract
Contaldi et al. [1] have suggested that an initial period of kinetic energy domination in single field inflation may explain the lack of CMB power at large angular scales. We note that in this situation it is natural that there also be a spatial gradient in the initial value of the inflaton field, and that this can provide a spatial asymmetry in the observed CMB power spectrum, manifest at low multipoles. We investigate the nature of this asymmetry and comment on its relation to possible anomalies at low multipoles.
25 pages, 12 figures. In this revised version, we include the Integrated Sachs-Wolfe effect, which was missing from the original. This modifies some results in the low multipoles. The comparison with experiment is slightly better but the change is not statistically significant
References in corpus (22)
- Wilkinson Microwave Anisotropy Probe (WMAP) Three Year Results: Implications for Cosmology
- Three-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Temperature Analysis
- Hemispherical power asymmetry in the three-year Wilkinson Microwave Anisotropy Probe sky maps
- The Uncorrelated Universe: Statistical Anisotropy and the Vanishing Angular Correlation Function in WMAP Years 1-3
- A Hemispherical Power Asymmetry from Inflation
- Cosmic Microwave Background Statistics for a Direction-Dependent Primordial Power Spectrum
- Predictions from an anisotropic inflationary era
- Inflationary perturbations in anisotropic backgrounds and their imprint on the CMB
- Inflation and WMAP three year data: Features have a Future!
- Superhorizon Perturbations and the Cosmic Microwave Background
- The Axis of Evil revisited
- Local Voids as the Origin of Large-angle Cosmic Microwave Background Anomalies: The Effect of a Cosmological Constant
- The pre-inflationary vacuum in the cosmic microwave background
- Global universe anisotropy probed by the alignment of structures in the cosmic microwave background
- Broken Isotropy from a Linear Modulation of the Primordial Perturbations
- Foreground Subtraction of Cosmic Microwave Background Maps using WI-FIT (Wavelet based hIgh resolution Fitting of Internal Templates)
- A Scaling Index Analysis of the WMAP three year data: Signatures of non-Gaussianities and Asymmetries in the CMB
- A model-independent test for scale-dependent non-Gaussianities in the CMB
- Analysis of the apparent lack of power in the cosmic microwave background anisotropy at large angular scales
- Local Pancake Defeats Axis of Evil
- CMB Anomalies from Relic Anisotropy
- A Remark on "A CMB/Dark Energy Cosmic Duality"