The Pesky Power Asymmetry

Abstract

Physical models for the hemispherical power asymmetry in the cosmic microwave background (CMB) reported by the Planck Collaboration must satisfy CMB constraints to the homogeneity of the Universe and quasar constraints to power asymmetries. We survey a variety of models for the power asymmetry and show that consistent models include a modulated scale-dependent isocurvature contribution to the matter power spectrum or a modulation of the reionization optical depth, gravitational-wave amplitude, or scalar spectral index. We propose further tests to distinguish between the different scenarios.

5 pages, 4 figures

References in corpus (13)

• Cosmology at Low Frequencies: The 21 cm Transition and the High-Redshift Universe
• Hemispherical power asymmetry in the three-year Wilkinson Microwave Anisotropy Probe sky maps
• A Hemispherical Power Asymmetry from Inflation
• Cosmic Microwave Background Statistics for a Direction-Dependent Primordial Power Spectrum
• Dipoles in the Sky
• Superhorizon Perturbations and the Cosmic Microwave Background
• Science with a lunar low-frequency array: from the dark ages of the Universe to nearby exoplanets
• Constraints on cosmic hemispherical power anomalies from quasars
• A Scale-Dependent Power Asymmetry from Isocurvature Perturbations
• Broken Isotropy from a Linear Modulation of the Primordial Perturbations
• Forecasted 21 cm constraints on compensated isocurvature perturbations
• Gauging the cosmic microwave background
• Seeking Inflation Fossils in the Cosmic Microwave Background

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• Testing physical models for dipolar asymmetry with CMB polarization
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• Loop quantum cosmology: relation between theory and observations
• Linking the BICEP2 result and the hemispherical power asymmetry through spatial variation of $r$
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• Joint Bayesian analysis of large angular scale CMB temperature anomalies
• Hemispherical asymmetry from an isotropy violating stochastic gravitational wave background
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• Coupling structure of multi-field primordial perturbations
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• Testing the scale-dependent hemispherical asymmetry with the 21-cm power spectrum from the epoch of reionization
• New Horizons in Cosmology with Spectral Distortions of the Cosmic Microwave Background
• Primordial anisotropies from cosmic strings during inflation
• Fingerprints of Anomalous Primordial Universe on the Abundance of Large Scale Structures
• Primordial inhomogeneities from massive defects during inflation
• Isotropic non-Gaussian $g_{\mathrm{NL}}$-like toy models that reproduce the cosmic microwave background anomalies
• Finslerian dipolar modulation of the CMB power spectra at scales $2<l<600$
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