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Volume 36, 2009
Dark Energy and Dark Matter: Observations, Experiments and Theories
Page(s) 3 - 9
DOI 10.1051/eas/0936001
Published online 30 May 2009

Dark Energy and Dark Matter: Observations, Experiments and Theories
E. Pécontal, T. Buchert, Ph. Di Stefano and Y. Copin (eds)
EAS Publications Series, 36 (2009) 3-9
DOI: 10.1051/eas/0936001

Does cosmological structure formation require dark energy?

S. Sarkar

Rudolf Peierls Centre for Theoretical Physics, University of Oxford, 1 Keble Road, Oxford OX1 3NP, UK;

s.sarkar@physics.ox.ac.uk

Published online: 30 May 2009

Abstract
Precision measurements of anisotropies in the cosmic microwave background and of the clustering of large-scale structure have supposedly established that the universe is presently dominated by “dark energy” which has negative pressure and behaves similarly to a cosmological constant. This is based on the assumption that the primordial density perturbation has a nearly scale-invariant power-law spectrum and that the dark matter consists of “cold” particles. However there are theoretical and observational indications that the spectrum is not scale-free and it is known that sub-eV mass neutrinos contribute a small component of hot dark matter. This would be sufficient to fit the same observational data without requiring any dark energy.


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© EAS, EDP Sciences 2009


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