Large scale anisotropic bias from primordial non-Gaussianity

作者：Baghram Shant^*; Namjoo Mohammad Hossein; Firouzjahi Hassan

来源：Journal of Cosmology and Astroparticle Physics, 2013, 2013(8): 048.

DOI：10.1088/1475-7516/2013/08/048

• power spectrum
• inflation

In this work we study the large scale structure bias in models of anisotropic inflation. We use the Peak Background Splitting, method in Excursion Set Theory to find the scale-dependent bias. We show that the amplitude of the bias is modified by a direction-dependent factor. In the specific anisotropic inflation model which we study, the scale-dependent bias vanishes at leading order when the long wavelength mode in squeezed limit is aligned with the anisotropic direction in the sky. We also extend the scale-dependent bias for to the general situations with primordial anisotropy. We find some selection rules indicating that some specific parts of a generic anisotropic bispectrum is picked up by the bias parameter. We argue that the anisotropic bias is mainly sourced by the angle between the anisotropic direction and the long wavelength mode in the squeezed limit.

• 出版日期2013-8