Nonlinear Effects in the Amplitude of Cosmological Density Fluctuations

Details Nonlinear Effects in the Amplitude of Cosmological Density Fluctuations Nonlinear Effects in the Amplitude of Cosmological Density Fluctuations

2009-01-06

arxiv.org/abs/0901.0697v3

JCAP 1002:021,2010

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

9 pages, 4 figures, 1 table. Accepted for publication in JCAP

Scientific paper

10.1088/1475-7516/2010/02/021

The amplitude of cosmological density fluctuations, sigma_8, has been studied and estimated by analysing many cosmological observations. The values of the estimates vary considerably between the various probes. However, different estimators probe the value of sigma_8 in different cosmological scales and do not take into account the nonlinear evolution of the parameter at late times. We show that estimates of the amplitude of cosmological density fluctuations derived from cosmic flows are systematically higher than those inferred at early epochs from the CMB because of nonlinear evolution at later times. We discuss the past and future evolution of linear and nonlinear perturbations, derive corrections to the value of sigma_8 and compare amplitudes after accounting for these differences.

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