Adam Brown

So if you ask me, you know,

99% of the matter in the solar system lives in the sun or on Jupiter.

And yet we seem to live in this really weird corner of the solar system.

Why is that?

I'm pretty confident that the answer to that is anthropic.

That if we lived in the center of the sun, we'd be dead.

And so one should expect intelligent life to live in this weird place in parameter space.

So that's perhaps my most confident answer to that question.

Why do we live...

where we live, then if we start talking about different constants of nature, we start getting different answers to that question.

Why is the universe tuned such that the proton is just a tiny bit more stable than the neutron?

That seems like that's begging for a anthropic answer.

Of course, if that's true, that demands that there be different places somewhere in the multiverse where, in fact, the neutron is slightly heavier than the...

The protons decay to neutrons rather than vice versa, and people just don't live there.

So if you want to go down that road, you end up being naturally drawn to the existence of these variables scanning over space.

Yes.

All you need is that there is different places in some larger possibility space where these quantities scan, where they take different values.

Bubble universe is just one way to do that.

We could just be different experiments, simulations in some meta universe somewhere.

I would say that there's three categories.