The angular anisotropy and bispectrum of the cosmological gravitational wave background can encode primordial perturbations, including order-one frequency dependence and primordial non-Gaussianity.
Non-Gaussianity in the Cosmic Microwave Background Anisotropies at Recombination in the Squeezed limit
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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 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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astro-ph.CO 1years
2019 1verdicts
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Anisotropies and non-Gaussianity of the Cosmological Gravitational Wave Background
The angular anisotropy and bispectrum of the cosmological gravitational wave background can encode primordial perturbations, including order-one frequency dependence and primordial non-Gaussianity.