Harrison-Z'eldovich primordial spectrum is consistent with observations

Abstract

Inflation predicts primordial scalar perturbations with a nearly scale-invariant spectrum and a spectral index approximately unity (the Harrison--Zel'dovich (HZ) spectrum). The first important step for inflationary cosmology is to check the consistency of the HZ primordial spectrum with current observations. Recent analyses have claimed that a HZ primordial spectrum is excluded at more than 99% c.l.. Here we show that the HZ spectrum is only marginally disfavored if one considers a more general reionization scenario. Data from the Planck mission will settle the issue.

4 Pages, 2 Figures

References in corpus (27)

• Efficient Computation of CMB anisotropies in closed FRW models
• Cosmological parameters from CMB and other data: a Monte-Carlo approach
• Baryon Acoustic Oscillations in the Sloan Digital Sky Survey Data Release 7 Galaxy Sample
• Reconstructing the Inflaton Potential --- an Overview
• Thick gas discs in faint dwarf galaxies
• CMB constraints on Dark Matter models with large annihilation cross-section
• High resolution CMB power spectrum from the complete ACBAR data set
• Improved measurements of the temperature and polarization of the CMB from QUaD
• Inflation after WMAP3: Confronting the Slow-Roll and Exact Power Spectra with CMB Data
• A Measurement of the Angular Power Spectrum of the CMB Temperature Anisotropy from the 2003 Flight of Boomerang
• Measurement of Cosmic Microwave Background Polarization Power Spectra from Two Years of BICEP Data
• Inflation model constraints from the Wilkinson Microwave Anisotropy Probe three-year data
• Deuterium Abundance in the Most Metal-Poor Damped Lyman alpha System: Converging on Omega_baryons
• Cosmic microwave background measurements can discriminate among inflation models
• A measurement of the polarization-temperature angular cross power spectrum of the Cosmic Microwave Background from the 2003 flight of BOOMERANG
• A Bayesian model selection analysis of WMAP3
• Cepheid Calibrations of Modern Type Ia Supernovae:Implications for the Hubble Constant
• The Impact of an Extra Background of Relativistic Particles on the Cosmological Parameters derived from Microwave Background Anisotropies
• The Cosmic Microwave Background and the Ionization History of the Universe
• Inflaton field potential producing the exactly flat spectrum of adiabatic perturbations
• The Shape of the Primordial Power Spectrum: A Last Stand Before Planck
• Inflationary potentials yielding constant scalar perturbation spectral indices
• How robust are inflation model and dark matter constraints from cosmological data?
• Latest inflation model constraints from cosmic microwave background measurements
• Single-field inflation constraints from CMB and SDSS data
• Reionization constraints from five-year WMAP data
• Delayed Recombination and Cosmic Parameters

Cited by in corpus (16)

• Galilean Genesis: an alternative to inflation
• Observational tests of inflation with a field derivative coupling to gravity
• Impact of neutrino properties on the estimation of inflationary parameters from current and future observations
• Bayesian Evidence against Harrison-Zel'dovich spectrum in tension cosmology
• Is the Harrison-Zel'dovich spectrum coming back? ACT preference for $n_s\sim 1$ and its discordance with Planck
• Non-Gaussianity in single field models without slow-roll
• Data-constrained reionization and its effects on cosmological parameters
• Impact of general reionization scenarios on extraction of inflationary parameters
• Featuring the primordial power spectrum: new constraints on interrupted slow-roll from CMB and LRG data
• Was there an early reionization component in our universe?
• Cosmological data and indications for new physics
• CMB Neutrino Mass Bounds and Reionization
• Principal component analysis of the reionization history from Planck 2015 data
• Reionization and CMB non-Gaussianity
• Reionization history and CMB parameter estimation
• Scale-invariant scalar spectrum from the nonminimal derivative coupling with fourth-order term