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Gravitational redshift of galaxies in clusters as predicted by general relativity

Author

Listed:
  • 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)

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.

Suggested Citation

  • Radosław Wojtak & Steen H. Hansen & Jens Hjorth, 2011. "Gravitational redshift of galaxies in clusters as predicted by general relativity," Nature, Nature, vol. 477(7366), pages 567-569, September.
    • Handle: RePEc:nat:nature:v:477:y:2011:i:7366:d:10.1038_nature10445
    DOI: 10.1038/nature10445
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