Stochastic inflation and the lower multipoles in the cosmic microwave background anisotropies

2004/05/27 by Michele Liguori, M. Liguori, S. Matarrese +5 · 56 citations
Physics and Astronomy · #Anisotropy #CMB cold spot #Cosmic background radiation #Cosmic microwave background #Cosmological perturbation theory #Cosmology and Gravitation Theories #Galaxies: Formation, Evolution, Phenomena #Inflation (cosmology) #Multipole expansion #Non-Gaussianity #Observable #Relativity and Gravitational Theory #Spectral density #astro-ph #hep-ph #hep-th

paper · pdf · doi:10.1088/1475-7516/2004/08/011

published in Journal of Cosmology and Astroparticle Physics 2004(08), 011 (Institute of Physics) · 9 pages, 2 figures

arxiv created 2004/05/27 · openalex publication_date 2004/08/17 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

We generalize the treatment of inflationary perturbations to deal with the non-Markovian coloured noise emerging from any realistic approach to stochastic inflation. We provide a calculation of the power spectrum of the gauge-invariant comoving curvature perturbation to first order in the slow-roll parameters. Properly accounting for the constraint that our local patch of the Universe is homogeneous on scales just above the present Hubble radius, we find a blue tilt of the power spectrum on the largest observable scales, in agreement with the WMAP data which show an unexpected suppression of the low multipoles of the CMB anisotropy. Our explanation of the anomalous behaviour of the lower multipoles of the CMB anisotropies does not invoke any ad hoc introduction of new physical ingredients in the theory.

Citations

• The statistical significance of the low cosmic microwave background mulitipoles
• Suppressing the lower multipoles in the CMB anisotropies
• The influence of super-horizon scales on cosmological observables generated during inflation
• Non-commutative inflation and the CMB
• An Infrared Cutoff Revealed by the Two Years of COBE Observations of Cosmic Temperature Fluctuations
• High resolution foreground cleaned CMB map from WMAP
• Reconstructing the primordial power spectrum
• First‐Year Wilkinson Microwave Anisotropy Probe ( WMAP ) Observations: Determination of Cosmological Parameters
• Particle Physics Models of Inflation and the Cosmological Density Perturbation

Cited by

• Inflationary stochastic anomalies
• A manifestly covariant theory of multifield stochastic inflation in phase space: solving the discretisation ambiguity in stochastic inflation