Meaning of Friedmann model

Fried'mann mod"el

Pronunciation: (frēd'mun), [key]
— Astron. Astron.
  1. any model of the universe deduced from a homogeneous, isotropic solution of Einstein's field equations without a cosmological constant. Such models form the mathematical basis for many modern cosmologies and provide for expansion or contraction of the universe. Also called
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.