“School of Astronomy”
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| Paper IPM / Astronomy / 12918 |
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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 directiondependent
factor. In the specific anisotropic inflation model which we study, the scaledependent
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
formulation 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
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