Friedmann model

American  

[freed-muhn] / ˈfrid mən /

noun

Astronomy.

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.

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Etymology

Origin of Friedmann model

Named after Alexander Friedmann, (1885–1925), Russian mathematician, who made the necessary calculations in 1922

Example Sentences

In the first kind of Friedmann model, which expands and recollapses, space is bent in on itself, like the surface of the earth.

From Literature

This assumes that the universe is described by a Friedmann model, right back to the big bang.

From Literature

A remarkable feature of the first kind of Friedmann model is that in it the universe is not infinite in space, but neither does space have any boundary.

From Literature

In the first Friedmann model, space is just like this, but with three dimensions instead of two for the earth’s surface.

From Literature

But which Friedmann model describes our universe?

From Literature