AMA | October 2024

2220.779 - 2244.992 Sean Carroll

It's absolutely clear how to get it in general relativity. The problem is that that if you're in a closed universe, that quantity is simply zero. it doesn't matter what is happening in the universe. As long as you're in a closed universe, then you can show mathematically that no matter what's going on inside, that energy is going to be zero. So it's not a very informative fact.