UNIGE document Scientific Article
previous document  unige:2566  next document
add to browser collection

The effect of structure formation on the expansion of the universe

Published in International Journal of Modern Physics. D. 2008, vol. 17, p. 2543-2548
Abstract Observations of the expansion rate of the universe at late times disagree by a factor of 1.5-2 with the prediction of homogeneous and isotropic models based on ordinary matter and gravity. We discuss how the departure from linearly perturbed homogeneity and isotropy due to structure formation could explain this discrepancy. We evaluate the expansion rate in a dust universe which contains non-linear structures with a statistically homogeneous and isotropic distribution. The expansion rate is found to increase relative to the exactly homogeneous and isotropic case by a factor of 1.1-1.3 at some tens of billion of years. The timescale follows from the cold dark matter transfer function and the amplitude of primordial perturbations without additional free parameters.
Full text
(ISO format)
RASANEN, Syksy. The effect of structure formation on the expansion of the universe. In: International Journal of Modern Physics. D, 2008, vol. 17, p. 2543-2548. https://archive-ouverte.unige.ch/unige:2566

231 hits



Deposited on : 2009-08-31

Export document
Format :
Citation style :