We estimate analytically the second-order cosmic microwave background temperature anisotropies at the recombination epoch in the squeezed limit and we deduce the contamination of 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.
Non-Gaussianity in the Cosmic Microwave Background Anisotropies at Recombination in the Squeezed Limit
BARTOLO, NICOLA;MATARRESE, SABINO;
2012
Abstract
We estimate analytically the second-order cosmic microwave background temperature anisotropies at the recombination epoch in the squeezed limit and we deduce the contamination of 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.File in questo prodotto:
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