Non-linearity of large-scale structure formation in the Universe

2005/08/17 by Lung-Yih Chiang, Chiang, Lung-Yih
Physics and Astronomy · #Astrophysics (astro-ph) #FOS: Physical sciences #astro-ph

paper · pdf · doi:10.48550/arxiv.astro-ph/0508375

talk in "Nonlinear Cosmology" workshop at ICTP, Trieste, May 2005. To appear in the special volume "Nonlinear Cosmology" of International J. of Modern Physics D

arxiv created 2005/08/17 · arxiv updated 2009/12/01

Abstract

In the standard picture of cosmological structure formation, the Universe we see today is evolved under the gravitational instability from tiny random fluctuations. In this talk I discuss the onset of non-linearity in the large scale structure formation of the Universe when the linear perturbation theory break downs. Using 1D Zel'dovich Approximation which provides an exact solution for density evolution, I illustrate two effects: mode spawning and mode merging and their connection to mode coupling. Those mode couplings (quadratic, cubic >...etc.) from gravitational clustering are in fact what the polyspectra (bispectrum, trispectrum...etc.) are meant to measure.

Related

• Large Scale Structure in the weakly non-linear regime
• Large-Scale Structure Formation in the Quasi-linear Regime
• The Wave Mechanics of Large-scale Structure
• Models for large-scale structure
• Cosmic Large-Scale Structure Formation from Newtonian Particle Dynamics