Uncorrelated estimates of the primordial power spectrum

Abstract

We use the localized principle component analysis to detect deviations from scale invariance of the primordial power spectrum of curvature perturbations. With the technique we make uncorrelated estimates of the primordial power spectrum with five wavenumber bins. In the framework of a minimal LCDM model, using the latest cosmic microwave background data from the WMAP and ACT experiments we find that more than 95% of the preferred models are incompatible with the assumption of scale-invariance, but still compatible with a power-law primordial spectrum. We also forecast the sensitivity and constraints achievable by the Planck experiment by performing Monte Carlo studies on simulated data. Planck could significantly improve the constraints on the primordial power spectrum, especially at small scales by roughly a factor of 4.

8 pages, 2 figures, 1 table, JCAP style, references added, published version. arXiv admin note: substantial text overlap with arXiv:1105.5916

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Cited by in corpus (13)

• Taiji Program: Gravitational-Wave Sources
• The Gravitational-Wave Physics
• Obtaining the CMB anomalies with a bounce from the contracting phase to inflation
• Model selection applied to reconstruction of the Primordial Power Spectrum
• Reconstruction of the primordial power spectrum of curvature perturbations using multiple data sets
• Reconstructing the primordial power spectrum from the CMB
• The heterotic string yields natural supersymmetry
• Reconstruction of the primordial power spectra with Planck and BICEP2
• Constraints on the Tensor-to-Scalar ratio for non-power-law models
• Factor ordering and large-volume dynamics in quantum cosmology
• Primordial power spectrum versus extension parameters beyond the standard model
• Precision jet measurements at HERA and determination of α_s
• Latest Constraints from Jet Measurements on Parton Distribution Functions and on the Strong Coupling Constant