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Paper   IPM / Astronomy / 13653
School of Astronomy
  Title:   CMB Hemispherical Asymmetry: Long Mode Modulation and non-Gaussianity
1.  M.H. Namjoo
2.  A. Abolhasani
3.  S. Baghram
4.  H. Firouzjahi
  Status:   Published
  Journal: JCAP
  Vol.:  2014
  Year:  2014
  Pages:   11
  Supported by:  IPM
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.

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