Adam Brown

Correct.

The rate at which the universe is exponentially increasing is set by the cosmological constant in which the volume of the universe is exponentially increasing.

So you can imagine a scenario in which there was a high cosmological constant that you have a

bubble universe that has a lower value of the cosmological constant.

It continues to expand.

You could make new bubble universes or new regions in that universe that have a lower cosmological constant, either naturally and spontaneously or due to action that we might take.

And

As long as that cosmological constant is non-negative, is zero positive, that universe will not implode.

If it is negative, that universe will eventually implode.

So you could imagine a cascade in which you go to lower and lower values of the cosmological constant.

There are a lot of engineering details to be worked out, but what I'm describing is a scenario that is not inconsistent with the known laws of physics.

How likely do you think this is?

If the laws of physics are as we believe them to be...

And if we do not blow ourselves up in some other way, this is a issue that our distant descendants will eventually have to confront.

That's a tricky question.

Yeah.

But since you asked it, I'd say probably 50%.

There's a lot we don't understand about any of these questions.

They're all super speculative.

It's an active area of research, how to combine quantum mechanics and expanding universes.