2008/11/30 by Nicola Bartolo, Antonio Riotto · 3 citations
Physics and Astronomy · #Background radiation #Bispectrum #Cosmic microwave background #Cosmological perturbation theory #Cosmology and Gravitation Theories #Epoch (astronomy) #Equilateral triangle #Noncommutative and Quantum Gravity Theories #Particle physics theoretical and experimental studies #Recombination #SIGNAL (programming language) #astro-ph #gr-qc #hep-ph #hep-th
paper · pdf · doi:10.1088/1475-7516/2009/03/017
LaTeX file; 11 pages. v2: Typos corrected; references added; comments about the effective non-linearity parameter added in Sec. IV; comments added in the conclusions of Sec. IV. v3: References added; some clarifications added as footnotes 4 and 6, and in Sec. 3. Matches version accepted for publication in JCAP
arxiv created 2009/02/10 · openalex publication_date 2009/03/11 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
The non-linear effects operating at the recombination epoch generate a non-Gaussian signal in the CMB anisotropies. Such a contribution is relevant because it represents a major part of the second-order radiation transfer function which must be determined in order to have a complete control of both the primordial and non-primordial part of non-Gaussianity in the CMB anisotropies. We provide an estimate of the level of non-Gaussianity in the CMB arising from the recombination epoch which shows up mainly in the equilateral configuration. We find that it causes a contamination to the possible measurement of the equilateral primordial bispectrum shifting the minimum detectable value of the non-Gaussian parameter f equil NL by Δ f equil NL = (10) for an experiment like Planck .