Even the most successful scientific theories imaginable will, by their very nature, have a limited range of validity. But we can theorize whatever we like, and when a new theory meets the following three criteria:
● it achieves all of the successes of the prevailing, pre-existing theory [in this case, no fine-tuning or a multiverse],
● it succeeds where the current theory is known to fail,
● and it makes novel predictions for hitherto unmeasured phenomena, distinct from the prior theory, that pass the critical observational or experimental tests,
It will supersede the current one as our best approximation of a scientific truth.Ethan Siegel, “Ask Ethan: What Does ‘Truth’ Mean To A Scientist?” at Forbes
See also: Ethan Siegel 2014: The multiverse is not the answer
Ethan Siegel 2019 An Astrophysicist Makes Clear Why A Multiverse MUST Exist
How to talk yourself into believing in a multiverse Ethan Siegel edition, 2018
Logic vs. the multiverse: Gunter Bechly offers some insights
Ethan Siegel tackles fine-tuning at Forbes
Also: Is there life Post-Truth?
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