303 | AMA | February 2025

11706.497 - 11731.017 Sean Carroll

It says we make an argument, a very hand-wavy argument to be sure. But the argument is, if you're not in empty de Sitter space, you approach it. It's basically the cosmic no hair theorem proven by Bob Wald back in the 1980s. And then there's a reason for that. The reason for that is that in the presence of a positive cosmological constant, de Sitter space is the highest entropy state.