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Friedmann universe, model universe developed in 1922 by the Russian meteorologist and mathematician Aleksandr Friedmann (1888–1925). He believed that Albert Einstein’s general theory of relativity required a theory of the universe in motion, as opposed to the static universe that scientists until
Alexander Friedmann was a Russian cosmologist and mathematician, who helped develop models that explained the development of the universe. In particular, his solutions to Einstein ’s field equations provided early evidence of an expanding universe, and the theoretical underpinnings for both the Big Bang and steady state models of the universe. Alexander (or Aleksandr) Alexandrovich Friedmann ...
Alexander Friedmann used Einstein’s general theory of relativity to propose a universe that could expand or contract.
The Friedmann equations are a set of dynamical equations describing the expansion of the universe based on its matter content. The Friedmann equations provide a model for describing many of the observational features of the universe and are widely used throughout modern cosmology.
THE FRIEDMANN EQUATION The basis to understanding how the expansion of the Universe can be speeding up lies in the Einstein equations. General relativity can tell us physically what factors relate to the expansion. One version of the Einstein equations is the Friedmann equation, which describes how the expansion rate changes over time, and why, in a homogeneous and isotropic Universe. 2 8 G ρ ...
