Astrophysics (index)

Einstein-De Sitter Model

(universe tuned to the smallest expansion that continues forever)

The Einstein-de Sitter Model of the universe posits it is constrained by Gravity according to General Relativity (GR), 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 provide a solution to Einstein's General Relativity equations, and modern models like Lambda-CDM model (ΛCDM) consider such a model to be a good first approximation of the universe.