Eternal inflation, bubble collisions, and the persistence of memory

Details Eternal inflation, bubble collisions, and the persistence of memory Eternal inflation, bubble collisions, and the persistence of memory

2006-12-21

arxiv.org/abs/hep-th/0612242v1

Phys.Rev.D76:123512,2007

Physics

High Energy Physics

High Energy Physics - Theory

27 pages, 3 figures

Scientific paper

10.1103/PhysRevD.76.123512

A ``bubble universe'' nucleating in an eternally inflating false vacuum will experience, in the course of its expansion, collisions with an infinite number of other bubbles. In an idealized model, we calculate the rate of collisions around an observer inside a given reference bubble. We show that the collision rate violates both the homogeneity and the isotropy of the bubble universe. Each bubble has a center which can be related to ``the beginning of inflation'' in the parent false vacuum, and any observer not at the center will see an anisotropic bubble collision rate that peaks in the outward direction. Surprisingly, this memory of the onset of inflation persists no matter how much time elapses before the nucleation of the reference bubble.

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