Even if we think of MWI as ‘everything duplicating’, Wiseman, it doesn’t have to happen faster than information about the event’s outcome travels, which is at the speed of light.
So if an electron on Earth causes a branching to take place, Alpha Centauri B wouldn’t have to split for about four years—because that’s how long it would take the information about the electron’s behavior to reach the star.
Even if we think of MWI as ‘everything duplicating’, Wiseman, it doesn’t have to happen faster than information about the event’s outcome travels, which is at the speed of light.
So if an electron on Earth causes a branching to take place, Alpha Centauri B wouldn’t have to split for about four years—because that’s how long it would take the information about the electron’s behavior to reach the star.