# Mass and Size of Dimension

1. Feb 26, 2009

### benk99nenm312

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?

2. Feb 27, 2009

### Ich

$$\ddot V / V = -1/2(\rho+P_x+P_y+P_z)$$
See http://math.ucr.edu/home/baez/einstein/einstein.html" [Broken].

Last edited by a moderator: May 4, 2017
3. Feb 27, 2009

### benk99nenm312

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?

4. Feb 27, 2009

### Ich

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

Last edited by a moderator: May 4, 2017