Don’t cut yourself on Occam’s razor

Many Worlds Theory

One of the most common criticisms of the many-worlds interpretation (MWI) of quantum mechanics is that it is absurdly complicated, and therefore violates Occam’s razor.  Most people’s first reaction, on hearing of MWI, think that the theory is (to quote Martin Gardner) “bizarre”, “monstrous”, “fantastic”, “radical”, “appalling”, “nonsense”, “frivolous”, and “low”.  And many people seem to think that theorists who ascribe to MWI have their heads in the clouds to believe such nonsense.  MWI seems to be taken, in fact, as evidence that physics has lost its way—as if (supposedly) blind belief in such frivolity is indicative of a philosophical rot that pervades theorists like me.

There are so many refutations of such criticisms that I don’t know where to start.  First of all, although MWI is popular, it is by no means canon, and I daresay that a majority of physicists reject it still.  So there!  We’re not all…

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