Sean Carroll

Do you know their papers?

The zero graphic distributions?

Yes.

That's right.

So they're just saying, look, okay, there's a universe out there, has a lot of Boltzmann brains in it.

A lot of them look like me.

I'm just going to have a probability distribution over which of those observers I am.

And that probability distribution is I'm not one of the Boltzmann brains.

I'm ordinary.

And that sounds similar to what you were just pushing, no?

But I guess – I mean I think I agree on everything you just said.

The thing that seems to be missing to me in the Hartl Shrednicki proposal that maybe there are lots of Boltzmann brains but I just know I'm not one of them is most people who would say that are Boltzmann brains.

Yeah.

In other words, if I grant you not only that you have the impression that, for example, I am in an office talking on a podcast with a computer, I grant you not only that I have that in my brain, but I grant you my whole past light cone, right?

I grant you a lot of universe where for billions of years it's been leading up to this, right?

In an eternally fluctuating universe, there'll be many such observers in many such past light cones.

And with overwhelming probability, tomorrow, the rest of the universe won't be there when I look at it, right?

Because it's just the whole universe fluctuated into existence.

That's still easier than the Big Bang fluctuated into existence.

So why are we ruling out being any of those people?