At the "Not Even Wrong" blog, mathematician Peter Woit recently asks, "Whose job is it to explain to the public that they were misled by overenthusiastic scientists?" For many years Woit has taken on the job of explaining to the public how the public is being misled by a belief community of overenthusiastic physicists called string theorists. Woit has long posted at this "Not Even Wrong" blog site, which you can reach here. By now he has been posting at the blog site for twenty years.
The site started out to help publicize his book "Not Even Wrong," which is a critique of a type of groundless physics speculation called string theory. Woit has published some very lucid posts that have criticized the overconfidence of speculative physicists and multiverse theorists. But while he has shown himself to be someone who is skillful at "pulling back the wizard's curtain" by exposing the bluster and bluffing of physicists passing themselves off as "grand lords of knowledge," Woit has confined such a skill to too narrow a field of study. Similar bluffing and bluster is going on in many other areas of science that Woit rarely writes about.
Woit has written 163 posts with a tag of "Multiverse Mania." In these posts he criticizes pretty well the extravagance and dogmatism of people who appeal to the idea of a vast collection of universes, without having any observational basis for such speculations. But as far as I can see. Woit has never shown much insight as to what caused multiverse speculations to arise. In his 2018 post "15 Years of Multiverse Mania" he says this:
"KKLT did not mention anthropics and the multiverse, but less than a month later Lenny Susskind published The Anthropic Landscape of String Theory, a call to arms for anthropics and a founding document of Multiverse Mania. He immediately went to work on writing a book-length version of string theory multiverse propaganda aimed at the public, The Cosmic Landscape, which was published in 2005."
The full title of that book makes very clear what Susskind's motivation was in promoting the idea of the multiverse. The title was "The Cosmic Landscape: String Theory and the Illusion of Intelligent Design." Susskind was very bothered by the reality of cosmic fine-tuning, the fact that in many ways our universe has laws and fundamental constants that seem very fine-tuned to allow our universe to be compatible with the existence of intelligent life, against all odds. The multiverse is a gigantically extravagant and utterly fallacious attempt to evade the implications of such a reality, the implication that our universe is the work of a purposeful agency. The multiverse theorist appeals to some infinity or near-infinity of universes, claiming that if there is such an infinity or near-infinity, having one life-compatible universe would not be so improbable.
This theoretical maneuver is futile, because by imagining a multiverse you do not change the odds of any one universe being compatible with the existence of life. Similarly, if I imagine an infinite universe filled with an infinite number of gamblers playing poker, that does nothing to change the odds of me being dealt three royal flushes while playing poker in a particular poker session. For a full discussion of all of the reasons why multiverse reasoning utterly fails to explain cosmic fine-tuning, read my posts here and here.
The factors that inspired multiverse speculations are depicted in the visual below:
The arising of multiverse claims was an act of desperation by people such as Susskind who were clearly bothered by how fined-tuned our universe is:
The desperation of an appeal to the multiverse was part of the evolution (or should we say the devolution) of materialism:
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