ACP Seminar (Astronomy - Cosmology - Particle Physics)

Speaker: Toshifumi Futamase (Tohoku U)
Title: WH expansion applied for the Non-linear Dark Matter Powr Spectrum and its Applications
Date (JST): Thu, Dec 19, 2013, 15:30 - 17:00
Place: Seminar Room A
Abstract: We apply the Wiener Hermite (WH) expansion to obtain an approximate expression for an accurate dark matter power spectrum in the full order of the expansion much beyond BAO scales. This method allows us to expand any random function in terms of an orthonormal basis in the space of random functions in such a way that the first order of the expansion expresses Gaussian distribution, and others are the deviation from the Gaussianity. This method gives physical meaning of the regularized Perturbation Method already developed. We mention also possible applications to various problems in the observational cosmology.