Probabilities in the inflationary multiverse

Details Probabilities in the inflationary multiverse Probabilities in the inflationary multiverse

2005-09-23

arxiv.org/abs/hep-th/0509184v3

JCAP 0601:017,2006

Physics

High Energy Physics

High Energy Physics - Theory

18 pages, RevTeX 4, 2 figures. Discussion of the full probability in Sec.VI is sharpened; the conclusions are strengthened. No

Scientific paper

10.1088/1475-7516/2006/01/017

Inflationary cosmology leads to the picture of a "multiverse," involving an infinite number of (spatially infinite) post-inflationary thermalized regions, called pocket universes. In the context of theories with many vacua, such as the landscape of string theory, the effective constants of Nature are randomized by quantum processes during inflation. We discuss an analytic estimate for the volume distribution of the constants within each pocket universe. This is based on the conjecture that the field distribution is approximately ergodic in the diffusion regime, when the dynamics of the fields is dominated by quantum fluctuations (rather than by the classical drift). We then propose a method for determining the relative abundances of different types of pocket universes. Both ingredients are combined into an expression for the distribution of the constants in pocket universes of all types.

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