## “School of Astronomy”

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Paper   IPM / Astronomy / 14694
School of Astronomy
Title:   Effective field theory of statistical anisotropies for primordial bispectrum and gravitational waves
Author(s):
 1 Tahereh. Rostami 2 Asieh. Karami 3 Hassan. Firouzjahi
Status:   Published
Journal: JCAP
Vol.:  2017
Year:  2017
Pages:   31
Supported by:            ipm IPM
Abstract:
We present the effective field theory studies of primordial statistical anisotropies in models of anisotropic inflation. The general action in unitary gauge is presented to calculate the leading interactions between the gauge field fluctuations, the curvature perturbations and the tensor perturbations. The anisotropies in scalar power spectrum and bispectrum are calculated and the dependence of these anisotropies to EFT couplings are presented. In addition, we calculate the statistical anisotropy in tensor power spectrum and the scalar-tensor cross correlation. Our EFT approach incorporates anisotropies generated in models with non-trivial speed for the gauge field fluctuations and sound speed for scalar perturbations such as in DBI inflation.

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