Non-Gaussianity in the Cosmic Microwave Background Anisotropies at Recombination in the Squeezed limit

Details Non-Gaussianity in the Cosmic Microwave Background Anisotropies at Recombination in the Squeezed limit Non-Gaussianity in the Cosmic Microwave Background Anisotropies at Recombination in the Squeezed limit

2011-09-09

arxiv.org/abs/1109.2043v2

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

LaTeX file; 15 pages. Slightly revised version. Main result unchanged

Scientific paper

We estimate analytically the second-order cosmic microwave background temperature anisotropies at the recombination epoch in the squeezed limit and we deduce the contamination to the primordial local non-Gaussianity. We find that the level of contamination corresponds to f_NL^{con}=O(1) which is below the sensitivity of present experiments and smaller than the value O(5) recently claimed in the literature.

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