Philosophical Review (forthcoming)

Authors
Yoaav Isaacs
Baylor University
John Hawthorne
Australian Catholic University
Jeffrey Sanford Russell
University of Southern California
Abstract
Is the fact that our universe contains fine-tuned life evidence that we live in a multiverse? Hacking (1987) and White (2000) influentially argue that it is not. We approach this question through a systematic framework for self-locating epistemology. As it turns out, leading approaches to self-locating evidence agree that the fact that our own universe contains fine-tuned life indeed confirms the existence of a multiverse (at least in a suitably idealized setting). This convergence is no accident: we present two theorems showing that in this setting, *any* updating rule that satisfies a few reasonable conditions will have the same feature. The conclusion that fine-tuned life provides evidence for a multiverse is hard to escape.
Keywords multiverse  self-locating evidence  Bayesianism  fine-tuning
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