Re:”So far as I know, MWI and collapse both make the exact same predictions”—nope:
``Many worlds is often referred to as a theory, rather than just an interpretation, by those who propose that many worlds can make testable predictions (such as David Deutsch) or is falsifiable (such as Everett) [...]″
Re:”So far as I know, MWI and collapse both make the exact same predictions”—nope:
``Many worlds is often referred to as a theory, rather than just an interpretation, by those who propose that many worlds can make testable predictions (such as David Deutsch) or is falsifiable (such as Everett) [...]″
http://en.wikipedia.org/wiki/Many-worlds_interpretation
The issue is laid out in the FAQ:
Q36 What unique predictions does many-worlds make?
http://www.hedweb.com/manworld.htm#unique
Q37 Could we detect other Everett-worlds?
http://www.hedweb.com/manworld.htm#detect