Scale-dependent CMB asymmetry from primordial configuration

Abstract

We demonstrate that a topological defect can explain the hemispherical power asymmetry of the CMB. The first point is that a defect configuration, which already exists prior to inflation, can source asymmetry of the CMB. The second point is that modulation mechanisms, such as the curvaton and other modulation mechanisms, can explain scale-dependence of the asymmetry. Using a simple analysis of the $\delta N$ formalism, we show models in which scale-dependent hemispherical power asymmetry is explained by primordial configuration of a defect.

14 pages, 3 figures, accepted for publication in JCAP

References in corpus (18)

• A Hemispherical Power Asymmetry from Inflation
• Primordial black hole formation from an axion-like curvaton model
• Superhorizon Perturbations and the Cosmic Microwave Background
• Constraints on cosmic hemispherical power anomalies from quasars
• A Scale-Dependent Power Asymmetry from Isocurvature Perturbations
• Non-isotropy in the CMB power spectrum in single field inflation
• Hemispherical Asymmetry and Local non-Gaussianity: a Consistency Condition
• The small scale power asymmetry in the cosmic microwave background
• CMB Power Asymmetry from Primordial Sound Speed Parameter
• A viable explanation of the CMB dipolar statistical anisotropy
• Runnings in the Curvaton
• Modulated Inflation
• Cosmological perturbations from inhomogeneous preheating and multi-field trapping
• Isocurvature and Curvaton Perturbations with Red Power Spectrum and Large Hemispherical Asymmetry
• Hilltop Curvatons
• Cosmological perturbations from an inhomogeneous phase transition
• Hemispherical Power Asymmetry from Scale-Dependent Modulated Reheating
• Modulated inflation from kinetic term

Cited by in corpus (14)

• Microwave Background Correlations from Dipole Anisotropy Modulation
• Large-scale anomalies in the cosmic microwave background as signatures of non-Gaussianity
• Pre-inflationary primordial perturbations
• Expected dipole asymmetry in CMB polarization
• Generating the cosmic microwave background power asymmetry with $g_{NL}$
• CMB hemispherical asymmetry from non-linear isocurvature perturbations
• Lensing as a Probe of Early Universe: from CMB to Galaxies
• Strongly scale-dependent CMB dipolar asymmetry from super-curvature fluctuations
• Primordial inhomogeneities from massive defects during inflation
• Primordial anisotropies from cosmic strings during inflation
• Scale-dependent CMB power asymmetry from primordial speed of sound and a generalized $\delta$N formalism
• Testing the scale-dependent hemispherical asymmetry with the 21-cm power spectrum from the epoch of reionization
• Hemispherical Power Asymmetry of the Cosmic Microwave Background from a Remnant of a pre-Inflationary Topological Defect
• Isotropic non-Gaussian $g_{\mathrm{NL}}$-like toy models that reproduce the cosmic microwave background anomalies