Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2011-09-29
Nature 477:567-569, 2011
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
Published in Nature issued on 29 September 2011. This version includes the Letter published there as well as the Supplementary
Scientific paper
10.1038/nature10445
The theoretical framework of cosmology is mainly defined by gravity, of which general relativity is the current model. Recent tests of general relativity within the \Lambda Cold Dark Matter (CDM) model have found a concordance between predictions and the observations of the growth rate and clustering of the cosmic web. General relativity has not hitherto been tested on cosmological scales independent of the assumptions of the \Lambda CDM model. Here we report observation of the gravitational redshift of light coming from galaxies in clusters at the 99 per cent confidence level, based upon archival data. The measurement agrees with the predictions of general relativity and its modification created to explain cosmic acceleration without the need for dark energy (f(R) theory), but is inconsistent with alternative models designed to avoid the presence of dark matter.
Hansen Steen H.
Hjorth Jens
Wojtak Radoslaw
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