The cosmic microwave background bispectrum from the non-linear evolution of the cosmological perturbations
- Institute of Cosmology and Gravitation, Dennis Sciama Building, Burnaby Road, Portsmouth, PO1 3FX (United Kingdom)
- Institut d'Astrophysique de Paris, UMR7095 CNRS, Université Pierre and Marie Curie — Paris, 98 bis bd Arago, 75014 Paris (France)
- Institut de Physique Théorique (IPhT), Commissariat à l'Energie Atomique (CEA), Orme des merisiers, 91191 Gif-sur-Yvette cédex (France)
This article presents the first computation of the complete bispectrum of the cosmic microwave background temperature anisotropies arising from the evolution of all cosmic fluids up to second order, including neutrinos. Gravitational couplings, electron density fluctuations and the second order Boltzmann equation are fully taken into account. Comparison to limiting cases that appeared previously in the literature are provided. These are regimes for which analytical insights can be given. The final results are expressed in terms of equivalent f{sub NL} for different configurations. It is found that for moments up to l{sub max} = 2000, the signal generated by non-linear effects is equivalent to f{sub NL} ≅ 5 for both local-type and equilateral-type primordial non-Gaussianity.
- OSTI ID:
- 22272775
- Journal Information:
- Journal of Cosmology and Astroparticle Physics, Vol. 2010, Issue 07; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
- Country of Publication:
- United States
- Language:
- English
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