At the end of the last post on falsifiability, I mentioned the possibility that the multiverse hypothesis might provide an explanation for the famous

It is sometimes said that Steven Weinberg showed that anthropic reasoning and the multiverse hypothesis correctly predict the value of the cosmological constant. This is however no longer true. This is partly because Steven Weinberg's argument, though brilliant, relied upon a few assumptions about the theory in which the multiverse was to be realised, and theory has subsequently developed not to support these assumptions but to negate them. And it is partly because, even given these assumptions, the original argument gives the wrong value when applied to cosmological observations from 2014 rather than 1987. Both theory and observation have moved away from the anthropic multiverse.

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*cosmological constant problem*. Today I'm going to try to elaborate a little on that argument and why I find it unconvincing.It is sometimes said that Steven Weinberg showed that anthropic reasoning and the multiverse hypothesis correctly predict the value of the cosmological constant. This is however no longer true. This is partly because Steven Weinberg's argument, though brilliant, relied upon a few assumptions about the theory in which the multiverse was to be realised, and theory has subsequently developed not to support these assumptions but to negate them. And it is partly because, even given these assumptions, the original argument gives the wrong value when applied to cosmological observations from 2014 rather than 1987. Both theory and observation have moved away from the anthropic multiverse.

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