Is there a formula for the shrinking of the universe due to object curvature?

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Earlier, I had a thought, and I have now been curious about the equation of this thought. Einstein's general relativity obviously states that objects curve and distort space. But the whole reason he came up with a cosmological constant was that he found that the curvature of all of the objects in space would essentially shrink the size of the universe. Is there a formula that represents this concept, and if so, what is it?
 
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Is there a formula that represents this concept, and if so, what is it?
\ddot V / V = -1/2(\rho+P_x+P_y+P_z)
See http://math.ucr.edu/home/baez/einstein/einstein.html" .
 
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What exactly do the variables and symbols in the equation stand for? I read the page you gave me, but I still don't fully understand it.

Also, How does this relate to the apparent shrinking of the universe?

Thanks in advance.
 
Just go on to http://math.ucr.edu/home/baez/einstein/node3.html" It should answer your questions better than I could.
 
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