Hurdles for Recent Measures in Eternal Inflation

Details Hurdles for Recent Measures in Eternal Inflation Hurdles for Recent Measures in Eternal Inflation

2006-11-21

arxiv.org/abs/hep-th/0611221v2

Phys.Rev.D75:123501,2007

Physics

High Energy Physics

High Energy Physics - Theory

15 PRD-style pages, 5 figures, expanded discussion of measures in Sec. II, added references

Scientific paper

10.1103/PhysRevD.75.123501

In recent literature on eternal inflation, a number of measures have been introduced which attempt to assign probabilities to different pocket universes by counting the number of each type of pocket according to a specific procedure. We give an overview of the existing measures, pointing out some interesting connections and generic predictions. For example, pairs of vacua that undergo fast transitions between themselves will be strongly favored. The resultant implications for making predictions in a generic potential landscape are discussed. We also raise a number of issues concerning the types of transitions that observers in eternal inflation are able to experience.

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