CMB anomalies from an inflationary model in string theory

Abstract

Recent Planck measurements show some CMB anomalies on large angular scales, which confirms the early observations by WMAP. We show that an inflationary model, in which before the slow-roll inflation the Universe is in a superinflationary phase, can generate a large-scale cutoff in the primordial power spectrum, which may account for not only the power suppression on large angular scales, but also a large dipole power asymmetry in the CMB. We discuss an implementation of our model in string theory.

6 pages, 4 figures, some refs. added and minor change

References in corpus (4)

• Three Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Polarization Analysis
• A Hemispherical Power Asymmetry from Inflation
• On Climbing Scalars in String Theory
• "Phantom" Inflation in Warped Compactification

Cited by in corpus (39)

• The Effective Field Theory of nonsingular cosmology: II
• Just enough inflation: power spectrum modifications at large scales
• Conformal Frame Dependence of Inflation
• Microwave Background Correlations from Dipole Anisotropy Modulation
• Propagating speed of primordial gravitational waves and inflation
• Super-inflation and generation of first order vector perturbations in ELKO
• 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
• Pre-inflationary primordial perturbations
• Primordial perturbations with pre-inflationary bounce
• Quantum Cosmology and the Evolution of Inflationary Spectra
• Emergent universe scenario and the low CMB multipoles
• Expected dipole asymmetry in CMB polarization
• The slow expansion with nonminimal derivative coupling and its conformal dual
• Magnetogenesis in bouncing cosmology
• Brane SUSY Breaking and the Gravitino Mass
• Pre-inflationary genesis with CMB B-mode polarization
• Implication of GW170817 for cosmological bounces
• Oscillating modulation to B-mode polarization from varying propagating speed of primordial gravitational waves
• Probing the primordial universe with gravitational waves detectors
• Parity violation in pre-inflationary bounce
• CMB hemispherical asymmetry from non-linear isocurvature perturbations
• Quantum Gravity, Time, Bounces and Matter
• Lensing as a Probe of Early Universe: from CMB to Galaxies
• Negative running prevents eternal inflation
• Scale-dependent hemispherical asymmetry from general initial state during inflation
• A String-Inspired Model for the Low-$\ell$ CMB
• Primordial inhomogeneities from massive defects 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
• Pre-Inflationary Relics in the CMB?
• Emergent universe revisited through the CSL theory
• Large Angular Scale CMB Anisotropy from an Excited Initial Mode
• String Theory clues for the low-$\ell$ CMB ?
• Studying G-axion Inflation model in light of PLANCK
• Nearly Full-Sky Low-Multipole Cosmic Microwave Background Temperature Anisotropy: III. CMB Temperature Anomalies
• Spectator fields and their imprints on the Cosmic Microwave Background
• Confronting phantom inflation with Planck data