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Occam's razor or the principle of ontological parsimony, tells us that, placed before two hypotheses, we should always consider the simpler of the two to be correct. Obviously this is not a universal law but has proved to be correct in a myriad of different occasions and fields.

Starting from these assumptions my question is the following: why should we consider the multiverse hypothesis when there are other macro-theories of a simpler nature (the holographic principle for example)?

The multiverse is certainly an interesting concept but it appears to me as an infinitely complex excuse to explain our inability to understand quantum indeterminacy.

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  • I made an edit which you may roll back or continue editing. – Frank Hubeny Jul 24 '19 at 13:27
  • Because everybody has their own ideas on what is "simpler", see SEP Simplicity. Supporters argue that multiverse is the parsimonious one, see e.g. Don’t cut yourself on Occam’s razor by Rave, and it and holography are not mutually exclusive, see e.g. Holographic Multiverse by Garriga-Vilenkin. – Conifold Jul 25 '19 at 6:09
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    How much extra metaphysics does MWI really involve? One is presumably happy with committing to this universe and in that sense it is just more of the same. If excessive electrons are unproblematic then why do worlds? Size doesn't matter. – User11 Jan 21 '20 at 6:58
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According to Wikipedia the association of Occam's razor to many worlds goes back to Hugh Everett who originated the idea of many worlds in 1957:

Since the wavefunction merely appears to have collapsed then, Everett reasoned, there was no need to actually assume that it had collapsed. And so, invoking Occam's razor, he removed the postulate of wavefunction collapse from the theory.

According to Wikipedia those who reject many worlds also use Occam's razor:

Occam's razor rules against a plethora of unobservable universes – Occam would prefer just one universe; i.e., any non-MWI.

And those supporting many worlds claim in response to this objection:

MWI response: Occam's razor actually is a constraint on the complexity of physical theory, not on the number of universes. MWI is a simpler theory since it has fewer postulates. Occams's razor is often cited by MWI adherents as an advantage of MWI.

If one wants to use Occam's razor to get a theory with the least amount of complexity, one could always use the philosophical theory of Occasionalism. Wikipedia describes this explanation of why things are the way they are as follows:

Occasionalism is a philosophical theory about causation which says that created substances cannot be efficient causes of events. Instead, all events are taken to be caused directly by God.

The theory with the least complexity, if that is what is most important, could be paraphrased as "God did it".

Wikipedia contributors. (2019, July 22). Many-worlds interpretation. In Wikipedia, The Free Encyclopedia. Retrieved 13:11, July 24, 2019, from https://en.wikipedia.org/w/index.php?title=Many-worlds_interpretation&oldid=907411360

Wikipedia contributors. (2019, June 10). Occasionalism. In Wikipedia, The Free Encyclopedia. Retrieved 13:19, July 24, 2019, from https://en.wikipedia.org/w/index.php?title=Occasionalism&oldid=901274339

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