Adam Brown

And if you get closer than that, you fall into the black hole and you're never getting out again.

And everybody can agree where that is.

For cosmology...

There is a point of no return, but the point of no return is return to a given person.

And so for each person, there is a different point of no return.

And as you say, we live on the boundary.

Just as much as we live on the boundary of those people live on our cosmological horizon, we may live on theirs.

I think I'm going to say yes and no.

I mean, it's so clearly, I mean, if correct, let's just take the quantum case, which is perhaps even more secure than the cosmological multiverse case.

In the quantum case, it really does look like

the default expectation, given everything we understand about quantum mechanics, should be the many worlds interpretation, in which the universe keeps branching off and there'd be more and more branches.

And every time, or almost every time you come to a point of quantum

a measurement we might locally say is made, that the universe branches, and then there's every possibility is represented still in the grander wave function.

That's a pretty profound thing to learn about the ontology of the world, if correct.

It seems like it should be the default expectation.

And you might say, you know, maybe I don't care about existential risk in our universe because, you know, we blow each other up or...

turn into goo or whatever.

Okay, that's sad for us.

Maybe our world has vacuum decay, but there are some other branches of the wave function where it's not.

And so I'm kind of, you know, some other branches would have made different choices in the past and they're sort of guaranteed to somewhere in the branches of the wave function to be a flourishing world.