Signature of Primordial Non-Gaussianity on Matter Power Spectrum

Understand

Employing the perturbative treatment of gravitational clustering, we discuss possible effects of primordial non-Gaussianity on the matter power spectrum.

• As gravitational clustering develops, the coupling between different Fourier modes of density perturbations becomes important and the primordial non-Gaussianity which intrinsically possesses a non-trivial mode-correlation can affect the late-time evolution of the power spectrum.
• We quantitatively estimate the non-Gaussian effect on power spectrum from the perturbation theory.
• The potential impact on the cosmological parameter estimation using the power spectrum are investigated based on the Fisher-matrix formalism.