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The '''Relativistic cosmology''' or, more precisely, the general-relativistic theory of [[cosmology]] started in 1922 with the work of A. Friedmann, who solved the Einstein's [[gravitational field equations]] and found that they allow for non-static cosmological solutions presenting an [[expanding universe]]. An extension of the A.Friedmann models was carried out by [[Georges-Henri Lemaître|G.Lemaître]], who considered universes with zero energy-momentum but with a non-zero [[cosmological constant]].<ref>{{cite web |title=Cosmological Relativity: A New Theory OF Cosmology|author=Silvia Behar and Moshe Carmeli (Department of Physics, Ben Gurion University )|publisher=Intrn. Journal Theor. Physics|year=2000|issue=39 (1375)|url=http://arxiv.org/pdf/astro-ph/0008352.pdf|accessdate=July 7, 2013}}</ref>
The '''Relativistic cosmology''' or, more precisely, the general-relativistic theory of [[cosmology]] started in 1922 with the work of A. Friedmann, who solved the Einstein's [[gravitational field equations]] and found that they allow for non-static cosmological solutions presenting an [[expanding universe]]. An extension of the A.Friedmann models was carried out by [[Georges-Henri Lemaître|G.Lemaître]], who considered universes with zero energy-momentum but with a non-zero [[cosmological constant]].<ref>{{cite web |title=Cosmological Relativity: A New Theory OF Cosmology|author=Silvia Behar and Moshe Carmeli (Department of Physics, Ben Gurion University )|publisher=Intrn. Journal Theor. Physics|year=2000|issue=39 (1375)|url=https://arxiv.org/pdf/astro-ph/0008352.pdf|accessdate=July 7, 2013}}</ref>
The standard big-bang cosmologies are relativistic and usually referred to as Friedmann-Lemaître cosmologies or FL cosmologies.<ref name="DismantlingBB">{{cite book|author=Alex Williams, John Hartnett|title=Dismantling the Big Bang|publisher=Master Books|location=Green Forest, AR, USA|year=2005|pages=290|isbn=978-0-89051-437-5|url=https://books.google.com/books?id=FR7basoxkSwC&printsec=frontcover&dq=hartnett+dismantling+the+big+bang&hl=en&sa=X&ei=JvNwT_6nJJOP4gTP6fG_Ag&sqi=2&ved=0CC4Q6AEwAA#v=onepage&q=hartnett%20dismantling%20the%20big%20bang&f=false|quote=}}</ref>
The standard big-bang cosmologies are relativistic and usually referred to as Friedmann-Lemaître cosmologies or FL cosmologies.<ref name="DismantlingBB">{{cite book|author=Alex Williams, John Hartnett|title=Dismantling the Big Bang|publisher=Master Books|location=Green Forest, AR, USA|year=2005|pages=290|isbn=978-0-89051-437-5|url=https://books.google.com/books?id=FR7basoxkSwC&printsec=frontcover&dq=hartnett+dismantling+the+big+bang&hl=en&sa=X&ei=JvNwT_6nJJOP4gTP6fG_Ag&sqi=2&ved=0CC4Q6AEwAA#v=onepage&q=hartnett%20dismantling%20the%20big%20bang&f=false|quote=}}</ref>