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4 papers · 2 filters
Eternal inflation, bubble collisions, and the persistence of memory
Jaume Garriga, Alan H. Guth, Alexander Vilenkin
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…
Probabilities in the Arkani-Hamed-Dimopolous-Kachru landscape
Delia Schwartz-Perlov
In a previous paper we found that in the context of the string theory ``discretuum'' proposed by Bousso and Polchinski, the cosmological constant probability distribution varies wi…
A measure of the multiverse
Alexander Vilenkin
I review recent progress in defining a probability measure in the inflationary multiverse. General requirements for a satisfactory measure are formulated and recent proposals for t…
Eternal observers and bubble abundances in the landscape
Vitaly Vanchurin, Alexander Vilenkin
We study a class of ``landscape'' models in which all vacua have positive energy density, so that inflation never ends and bubbles of different vacua are endlessly ``recycled''. In…