Gravitational redshift of galaxies in clusters as predicted by general relativity

Radosław Wojtak (), Steen H. Hansen and Jens Hjorth
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Radosław Wojtak: Dark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, DK-2100 Copenhagen Ø, Denmark
Steen H. Hansen: Dark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, DK-2100 Copenhagen Ø, Denmark
Jens Hjorth: Dark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, DK-2100 Copenhagen Ø, Denmark

Nature, 2011, vol. 477, issue 7366, 567-569

Abstract: Cosmic-scale test for general relativity Testing general relativity on the large scales of the Universe remains a fundamental challenge to modern cosmology. The theoretical framework of cosmology is defined by gravity, for which general relativity is the current model. Wojtak et al. now show that a classical test of general relativity — the gravitational redshift experienced by photons propagating outwards from a gravitational potential well — provides a direct means of testing gravity on scales of several megaparsecs, independent of cosmology. Their observations of the gravitational redshift of light coming from galaxies in clusters at the 99% confidence level agree with the predictions of general relativity, and are inconsistent with alternative models designed to avoid the presence of dark matter.

Date: 2011
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DOI: 10.1038/nature10445

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