Unambiguous probabilities in an eternally inflating universe

Abstract

``Constants of Nature'' and cosmological parameters may in fact be variables related to some slowly-varying fields. In models of eternal inflation, such fields will take different values in different parts of the universe. Here I show how one can assign probabilities to values of the ``constants'' measured by a typical observer. This method does not suffer from ambiguities previously discussed in the literature.

7 pages, Final version (minor changes), to appear in Phys. Rev. Lett

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• Recycling universe

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