I just threw Schrodinger's cat outside the future light cone. In your Everett branch is the cat alive or dead?
It seems to me that asking about the state of something in "your" Everett branch while it's outside your light cone is rather meaningless. The question doesn't really make sense. Someone with a detailed knowledge of physics in this situation can predict what an observer anywhere will observe.
But in general, your point is correct. We do have a very hard time trying to learn about events outside our light cone, etc. But the message in the quote is simply the idea that an uncertain map != an uncertain territory.
The question doesn't really make sense. Someone with a detailed knowledge of physics in this situation can predict what an observer anywhere will observe.
No they can't. They most certainly can't predict what the observer that is right next to the damn box with the cat in it will observe when it opens the box. In fact, they can't even predict what all observers anywhere in my future light cone will observe (just those observations that could ever be sent back to me).
Here's the new thread for posting quotes, with the usual rules: