Galaxy clusters back general relativity

Published in Physics World, 28 Sep 2011

A study of light coming from galaxy clusters has yet again given the thumbs up to the general theory of relativity, Albert Einstein’s famous theory of gravity. Done by physicists in Denmark who measured gravitational redshift, the research appears to rule out some alternative models of gravity – particularly those that deny the existence of dark matter.

Since its publication in 1916, the general theory of relativity has defied all experimental attempts to prove it wrong. In the currently favoured “cosmological constant and cold dark matter” model (?CDM) of cosmology, general relativity has successfully explained many aspects of the universe, including the cosmic-microwave background, gravitational lensing and large-scale structure. […]

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