CMB dipole asymmetry from a fast roll phase

Abstract

The observed CMB (cosmic microwave background) dipole asymmetry cannot be explained by a single field model of inflation - it inevitably requires more than one field where one of the fields is responsible for amplifying the super-Hubble fluctuations beyond the pivot scale. Furthermore the current constraints on $f_{N}L$ and $ta{u}_{N}L$ require that such an amplification cannot produce large non-Gaussianity. In this paper we propose a model to explain this dipole asymmetry from a spectator field, which is responsible for generating all the curvature perturbations, but has a temporary fast roll phase before the Hubble exit of the pivot scale. The current data prefers spectator scenario because it leaves no isocurvature perturbations. The spectator model will also satisfy the well-known constraints arising from quasars, and the quadrupole and octupole of the CMB.

arXiv comment15 pages, 5 figures, revision accepted by JCAP

References in corpus (37)

• Planck 2013 results. XVI. Cosmological parameters
• Nine-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Parameter Results
• Generating the curvature perturbation without an inflaton
• 4-Year COBE DMR Cosmic Microwave Background Observations: Maps and Basic Results
• Adiabatic CMB perturbations in pre-big bang string cosmology
• Effects of Cosmological Moduli Fields on Cosmic Microwave Background
• The primordial density perturbation in the curvaton scenario
• Asymmetries in the CMB anisotropy field
• Planck 2018 results. VII. Isotropy and Statistics of the CMB
• Planck 2013 Results. XXIV. Constraints on primordial non-Gaussianity
• Particle physics models of inflation and curvaton scenarios
• Gauge invariant MSSM inflaton
• Hemispherical power asymmetry in the three-year Wilkinson Microwave Anisotropy Probe sky maps
• MSSM flat direction inflation: slow roll, stability, fine tunning and reheating
• A Hemispherical Power Asymmetry from Inflation
• Superhorizon Perturbations and the Cosmic Microwave Background
• Fast-Roll Inflation
• Non-Gaussianity from Preheating
• Obtaining the CMB anomalies with a bounce from the contracting phase to inflation
• Constraints on cosmic hemispherical power anomalies from quasars
• Non-Gaussianity from Instant and Tachyonic Preheating
• The Pesky Power Asymmetry
• A-term inflation and the smallness of the neutrino masses
• A Scale-Dependent Power Asymmetry from Isocurvature Perturbations
• Very Large Primordial Non-Gaussianity from multi-field: Application to Massless Preheating
• The CMB asymmetry from inflation
• Low & High scale MSSM inflation, gravitational waves and constraints from Planck
• Non-isotropy in the CMB power spectrum in single field inflation
• Hemispherical Asymmetry and Local non-Gaussianity: a Consistency Condition
• Small non-Gaussianity and dipole asymmetry in the CMB
• Directional dependence of CMB parity asymmetry
• Inflation and primordial power spectra at anisotropic spacetime inspired by Planck's constraints on isotropy of CMB
• Visible sector inflation and the right thermal history in light of Planck data
• Isocurvature and Curvaton Perturbations with Red Power Spectrum and Large Hemispherical Asymmetry
• The curvaton scenario in the MSSM and predictions for non-Gaussianity
• Cosmological perturbations from a Spectator field during inflation
• Creating perturbations from a decaying field during inflation

Cited by in corpus (34)

• Power asymmetry in WMAP and Planck temperature sky maps as measured by a local variance estimator
• Asymmetric Sky from the Long Mode Modulations
• Microwave Background Correlations from Dipole Anisotropy Modulation
• CMB Power Asymmetry from Primordial Sound Speed Parameter
• Large-scale anomalies in the cosmic microwave background as signatures of non-Gaussianity
• Inflationary power asymmetry from primordial domain walls
• CMB Hemispherical Asymmetry: Long Mode Modulation and non-Gaussianity
• Constraining $\mathcal{N}=1$ supergravity inflation with non-minimal Kähler operators using $\delta N$ formalism
• Pre-inflationary primordial perturbations
• Hemispherical Power Asymmetry from a Space-Dependent Component of the Adiabatic Power Spectrum
• Scale-dependent non-Gaussianity and the CMB Power Asymmetry
• Expected dipole asymmetry in CMB polarization
• Isotropization of the universe during inflation
• The hemispherical asymmetry from a scale-dependent inflationary bispectrum
• Beyond the Boost: Measuring the intrinsic dipole of the CMB using the spectral distortions of the monopole and quadrupole
• Hemispherical Power Asymmetry from Scale-Dependent Modulated Reheating
• Relating the inhomogeneous power spectrum to the CMB hemispherical anisotropy
• CMB hemispherical asymmetry from non-linear isocurvature perturbations
• Imprint of Inhomogeneous and Anisotropic Primordial Power Spectrum on CMB Polarization
• Lensing as a Probe of Early Universe: from CMB to Galaxies
• Anisotropic cosmology and inflation from tilted Bianchi IX model
• Scale-dependent hemispherical asymmetry from general initial state during inflation
• Scale-dependent CMB power asymmetry from primordial speed of sound and a generalized $\delta$N formalism
• Primordial anisotropies from cosmic strings during inflation
• Testing the scale-dependent hemispherical asymmetry with the 21-cm power spectrum from the epoch of reionization
• Primordial inhomogeneities from massive defects during inflation
• Noncommutative Geometry and the Primordial Dipolar Imaginary Power Spectrum
• Isotropic non-Gaussian $g_{\mathrm{NL}}$-like toy models that reproduce the cosmic microwave background anomalies
• Cosmic Microwave Background Dipole Asymmetry could be explained by Axion Monodromy Cosmic Strings
• CMB Polarization by the Asymmetric Template of Scalar Perturbations
• Detecting CMB modulations and non-Gaussianities from power multipoles
• Spectator fields and their imprints on the Cosmic Microwave Background
• Hidden in the background: a local approach to CMB anomalies
• Dipole Modulation in Tensor Modes: Signatures in CMB Polarization