Search for features in the spectrum of primordial perturbations using Planck and other datasets

Abstract

We reconstruct the power spectrum of primordial curvature perturbations by applying a well-validated non-parametric technique employing Tikhonov regularisation to the first data release from the Planck satellite. To improve the reconstruction on small spatial scales we include data from the ground-based ACT and SPT experiments, the WiggleZ galaxy redshift survey, the CFHTLenS tomographic weak lensing survey, and spectral analysis of the Lyman-alpha forest. The reconstructed scalar spectrum (assuming the standard LCDM cosmology) is not scale-free but has an infrared cutoff at k < 5 x 10^-4 Mpc^-1 and several ~2-3 sigma features, of which two at wavenumber k/Mpc^-1 ~ 0.0018 and 0.057 had been seen already in WMAP data. A higher significance feature at k ~ 0.12 Mpc^-1 is indicated by Planck data, but may be sensitive to the systematic uncertainty around multipole l ~ 1800 in the 217x217 GHz cross-spectrum. In any case accounting for the 'look elsewhere' effect drops its global significance to ~2 sigma.

35 pages, 18 figures; Discussion of tensor reconstruction removed; Matches published version

References in corpus (10)

• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Angular Power Spectra
• Mass Calibration and Cosmological Analysis of the SPT-SZ Galaxy Cluster Sample Using Velocity Dispersion ${\sigma }_v$ and X-ray $Y_{\text{X}}$ Measurements
• The extended ROSAT-ESO Flux Limited X-ray Galaxy Cluster Survey (REFLEX II) IV. X-ray Luminosity Function and First Constraints on Cosmological Parameters
• Using BBN in cosmological parameter extraction from CMB: a forecast for Planck
• Primordial power spectrum from Planck
• Is there concordance within the concordance $\Lambda$CDM model?
• A combined analysis of 3D Weak Lensing, Lyman-alpha forest and WMAP year three data
• Reconstruction of the primordial power spectra with Planck and BICEP2
• Light Sterile Neutrinos and Inflationary Freedom
• PRISM: Recovery of the primordial spectrum from Planck data

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• Quantum-gravitational effects on gauge-invariant scalar and tensor perturbations during inflation: The slow-roll approximation
• Quantum Gravity in the Sky: Interplay between fundamental theory and observations
• Soundness of Dark Energy properties
• Primordial Features from Linear to Nonlinear Scales
• Non-Gaussianity and Secondary Gravitational Waves from Primordial Black Holes Production in $\alpha$-attractor Inflation
• Inflation in the closed FLRW model and the CMB
• Constraints on inflation with LSS surveys: features in the primordial power spectrum
• Dark Radiation and Inflationary Freedom after Planck 2015
• The look-elsewhere effect from a unified Bayesian and frequentist perspective
• Implications for primordial black holes from cosmological constraints on scalar-induced gravitational wave
• Hint of a truncated primordial spectrum from the CMB large-scale anomalies
• CMB anomalies and the effects of local features of the inflaton potential
• Classicalization of Quantum Fluctuations at the Planck Scale in the R_h=ct Universe
• Effect of damped oscillations in the inflationary potential
• Correlated primordial spectra in effective theory of inflation
• Searching for local features in primordial power spectrum using genetic algorithms
• Reconstructing the EFT of Inflation from Cosmological Data
• Understanding large scale CMB anomalies with the generalized non-minimal derivative coupling during inflation
• Reconstruction of a direction-dependent primordial power spectrum from Planck CMB data
• Implications of Pulsar Timing Array Results for High Frequency Gravitational Waves
• Self-Calibrating the Look-Elsewhere Effect: Fast Evaluation of the Statistical Significance Using Peak Heights
• Exploring Early and Late Cosmology with Next Generation Surveys
• On primordial equation of state transitions
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• Shapes and features of the primordial bispectrum
• Spectral Distortion Signatures of Step-like Inflationary Potential
• Degeneracy in the spectrum and bispectrum among featured inflaton potentials
• A search for super-imposed oscillations to the primordial power spectrum in Planck and SPT-3G 2018 data
• The scalar-scalar-tensor inflationary three-point function in the axion monodromy model
• Inflation Story: slow-roll and beyond
• A Map Between Primordial Power Spectra and the Effective Field Theory of Inflation
• Galaxy number-count dipole and superhorizon fluctuations