Scott Aaronson's cautious optimism for the MWI

calef

http://www.scottaaronson.com/blog/?p=1103

Eliezer's gung-ho attitude about the realism of the Many Worlds Interpretation always rubbed me the wrong way, especially in the podcast between both him and Scott (around 8:43 in http://bloggingheads.tv/videos/2220). I've seen a similar sentiment expressed before about the MWI sequences. And I say that still believing it to be the most seemingly correct of the available interpretations.

I feel Scott's post does an excellent job grounding it as a possibly correct, and in-principle falsifiable interpretation.

http://www.scottaaronson.com/blog/?p=1103

I feel Scott's post does an excellent job grounding it as a possibly correct, and in-principle falsifiable interpretation.

No, you read it right. However, instrumentally, the map-territory relation is just a model, like any other, though somewhat more general. It postulates existence of some immutable objective reality with fixed laws, something to be studied ("mapped"). While this may appear self-evident to a realist, one ought to agree that it is still an assumption, however useful it might be. And it is indeed very useful: it explains why carefully set up experiments are repeatable, and assures you that they will continue to be. Thus it is easy to forget that it is impossible to verify that "territory exists independently of our models of it", and go on arguing which of many experimentally indistinguishable territories is the real one. And once you do, behold the great "MWI vs Copehagen" LW debate. If you remember that territory is in the map, not in the territory, the debate is exposed as useless, until different models of the territory can be distinguished experimentally. Which will hopefully happen in the cantilever experiment.

The territory is not in the map, because that is nonsense.

That does not beg the question against instrumentalism and jn favour.of realism, because the territory does not have to exist at all.

Realists and anti realists are arguing about whether the territory exists, not where.

0Luke_A_Somers14y

This is one of those times it really is useful to pull out definitions... and for any reasonable definition of 'territory' and 'map', that's self-evidently true. Our models, even if correct, are underdetermined to the point that they cannot completely explain everything. Therefore, there's something else. That's what we call the 'territory'. Whether the territory is vastly different from our models or simply more detailed, they do not coincide. And on the word 'independent' - well, the territory contains the map, so there's no short-circuit if the territory has map dependence.