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Einstein-de Sitter model

(Einstein-de Sitter universe)
(universe tuned to the smallest expansion that continues forever)

The Einstein-de Sitter model of the universe (i.e., Einstein-de Sitter universe) posits it is constrained by gravity according to general relativity, and expanding just enough that it will continue expanding to infinity, and no more than that. (Analogous is a rocket launched at exactly escape velocity and no more.) It is a particular Friedmann model for a particularly flat matter-only universe. Friedmann models (or Friedmann universes) are models of the universe adhering to the Friedmann equations, a solution to Einstein's general relativity equations, and are, in effect, approximations of modern models like the Lambda-CDM model.

An earlier model, a de Sitter universe, represents a theoretical universe simplified in that the effects of matter are ignored. It showed expansion of the universe and was early among models that did so.


(physics,model,cosmology)
http://en.wikipedia.org/wiki/Einstein-_Sitter_universe
https://ned.ipac.caltech.edu/level5/Watson/Watson2_4_1.html
http://www.einsteins-theory-of-relativity-4engineers.com/einstein-de-sitter.html

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