A static cosmological model made isotropic and homogeneous by removing all mass from the universe. Eric Weisstein's World of Astronomy The resulting expanding universe Eric Weisstein's World of Astronomy had density of zero and constant curvature. In this model, the radius as a function of time is given by
where H is the Hubble constant, equal to
where is the cosmological constant (Weinberg 1972, p. 615).
Einstein-de Sitter Cosmological Model
References
de Sitter, W. "On the Relativity of Inertia: Remarks Concerning Einstein's Latest Hypothesis." Proc. Kon. Ned. Akad. Wet. 19, 1217-1225, 1917a.
de Sitter, W. "The the Curvature of Space." Proc. Kon. Ned. Akad. Wet. 20, 229-243, 1917b.
de Sitter, W. Proc. Kon. Ned. Akad. Wet. 20, 1309, 1917c.
de Sitter, W. Mon. Not. Roy. Astron. Soc. 78, 3, 1917d.
Weinberg, S. Gravitation and Cosmology: Principles and Applications of the General Theory of Relativity. New York: Wiley, p. 615, 1972.
