Simulated universes?


The following post is an off the cuff response to a recent article (link below) and to an idea that is floating around a lot these days, (perhaps largely due to its popularisation by Elon Musk via Nick Bostrom), but has a much longer history:

This is a fun article, but there are numerous things “wrong” with the simulated universe thought experiment (it most certainly isn’t a “theory”), not least of which is the fact that you can’t (at least in science, theology is another matter) base a generally applicable statistical argument on premises for which there is no evidence, i.e. the premise that it is possible to generate such a simulation (even if {and this is already an if} it’s possible in principle, this doesn’t make it possible in practice).

Note that claiming functionalism is “our best theory” (I happen to agree that it is, but many do not) is vastly different from claiming that we could generate an experience with the complexity and coherence of that generated by the universe/multiverse in which we find ourselves. This is a bit of a bait-and-switch.

It also makes assumptions about the nature of time and the generation of complexity that are not even close to being “accepted facts”.

It also suffers from vulnerability to infinite regress, as stated in the article. As a cosmological argument (i.e. a way of explaining why we find ourselves in a universe like the one in which we find ourselves), the simulated universe is essentially theological. As well as infinite regress in the form mentioned in the article, it also suffers from infinite regress with regard to the “problem of fine-tuning” (which is not really relevant to this particular article, I know).

Anyway, it’s a great thought experiment and some fantastic short stories (not least of which by Stanislaw Lem, long before Bostrom wrote about it) have explored it. But it remains great science fiction, which I love but find slightly irksome when presented as plausible science fact.


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