Making predictions in the multiverse

Details Making predictions in the multiverse Making predictions in the multiverse

2011-05-02

arxiv.org/abs/1105.0244v2

Physics

High Energy Physics

High Energy Physics - Theory

20 pages, 3 figures; invited review for Classical and Quantum Gravity; v2: references improved

Scientific paper

I describe reasons to think we are living in an eternally inflating multiverse where the observable "constants" of nature vary from place to place. The major obstacle to making predictions in this context is that we must regulate the infinities of eternal inflation. I review a number of proposed regulators, or measures. Recent work has ruled out a number of measures by showing that they conflict with observation, and focused attention on a few proposals. Further, several different measures have been shown to be equivalent. I describe some of the many nontrivial tests these measures will face as we learn more from theory, experiment, and observation.

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