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The '''matter-dominated era''' was the epoch in the evolution of the Universe that began when the [[radiation-dominated era]] ended, when the Universe was about 47,000 years old.<ref>Ryden, Barbara, "Introduction to Cosmology", 2006, eqn. 6.41</ref> Although it was often said that we still live in the matter-dominated era, it is more correct to say that when the Universe was about 9.8 billion years old,<ref>Ryden, Barbara, "Introduction to Cosmology", 2006, eqn. 6.33</ref> this era ended and was replaced by the [[dark-energy-dominated era]]. This change of the perspective occurred when the [[cosmological constant]] or [[dark energy]] was first observed in the late 1990s.

In the matter-dominated era, the energy density of matter exceeds the energy density of radiation in the universe (and it should exceed the vacuum energy density i.e. dark energy, too).<ref>Zelik, M and Gregory, S: "Introductory Astronomy & Astrophysics", page 497. Thompson Learning, Inc. 1998</ref>

For a matter dominated universe the evolution of the [[FRW|scale factor]] in the [[FRW|Friedmann-Lemaitre-Robertson-Walker metric]] is easily obtained solving the [[Friedmann equations]]:

:<math>a(t)\propto t^{2/3}</math>

== References ==
<references/>

[[Category:Physical cosmology]]


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