Measuring the cosmological density perturbation

Abstract

Precision measurements of anisotropies in the cosmic microwave background and of the clustering of large-scale structure have supposedly confirmed that the primordial density perturbation has a (nearly) scale-invariant spectrum. However this conclusion is based on assumptions about the world model and the nature of the dark matter. Physical models of inflation suggest that the spectrum may not in fact be scale-free, which would imply rather different cosmological parameters on the basis of the same observational data.

6 pages, 4 figures; Talk at Workshop on `The Density Perturbation in the Universe', Athens, June 2004 (references added, no change in text)

References in corpus (3)

• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)
• Multiple inflation and the WMAP 'glitches'
• The Cosmic Microwave Background and Inflation Parameters

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• Accelerated expansion from structure formation
• Constraints on backreaction in dust universes
• Features in the Primordial Spectrum from WMAP: A Wavelet Analysis
• Is a step in the primordial spectral index favored by CMB data ?
• Dark energy and decompactification in string gas cosmology
• Blackbody radiation in κ-Minkowski spacetime
• Density fluctuations in $\kappa$-deformed inflationary universe