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CMB Hemispherical Asymmetry: Long Mode Modulation and non-Gaussianity

The observed hemispherical asymmetry in CMB map can be explained by modulation from a long wavelength super horizon mode which non-linearly couples to the CMB modes. We address the criticism in [1] about the role of non-Gaussianities in squeezed and equilateral configurations in generating hemispherical asymmetry from the long mode modulation. We stress that the modulation is sensitive to the non-Gaussianity in the squeezed limit. In addition, we demonstrate the validity of our approach in providing a consistency condition relating the amplitude of dipole asymmetry to f_{NL} in the squeezed limit.

preprint2014arXivOpen access
Mohammad Hossein NamjooAli Akbar AbolhasaniShant BaghramHassan Firouzjahi
astro-ph.COhep-th
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Mohammad Hossein NamjooAli Akbar AbolhasaniShant BaghramHassan Firouzjahi

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