Friedmann Acceleration Equation. In the previous section we have talked about distances so like in any system in classical mechanics we need a reference point and a reference frame to de ne the dis tances. It expresses the basic idea of the field equations which is that non tidal curvature left hand side is caused by the matter that is present locally right hand side.
C o o c h 0 2 a 0 2 where a 0 and h 0 are separately the scale factor and the hubble parameter today. Besides this the acceleration equation 4 does not depend on the curvature parameter. Go to print article.
C 3h 0 2 8p.
Take the time derivative 2 a a 8πg 3c2 ǫa 2 2ǫaa divide by 2 aa a a 4πg 3c2 ǫ a a 2ǫ. Let s refer to it as the acceleration equation. Set a ãa 0. Friedmann 1888 1925 the man who made the universe expand soviet mathematician and meteorologist most famous for contributions to cosmology first person to mathematically predict an expanding universe 1922 derived from einstein s general relativity einstein initially dismissed friedmann s equations.
