Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 2, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1475-7516/2010/02/021
Keywords
cosmic flows; cosmological parameters from LSS; power spectrum; cosmological parameters from CMBR
Funding
- Polish Ministry of Science [NN203 2942 34]
- INTAS [06-1000017-9258]
- Research Corporation
- NSF [AST-0807326]
- National Science Foundation through TeraGrid
- STFC
- Science and Technology Facilities Council [ST/G001901/1] Funding Source: researchfish
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [0807326] Funding Source: National Science Foundation
- STFC [ST/G001901/1] Funding Source: UKRI
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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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