Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2007-06-21
JHEP0709:034,2007
Physics
High Energy Physics
High Energy Physics - Theory
35 pages, 8 figures
Scientific paper
10.1088/1126-6708/2007/09/034
We consider the cosmological dynamics associated with volume weighted measures of eternal inflation, in the Bousso-Polchinski model of the string theory landscape. We find that this measure predicts that observers are most likely to find themselves in low energy vacua with one flux considerably larger than the rest. Furthermore, it allows for a satisfactory anthropic explanation of the cosmological constant problem by producing a smooth, and approximately constant, distribution of potentially observable values of Lambda. The low energy vacua selected by this measure are often short lived. If we require anthropically acceptable vacua to have a minimum life-time of 10 billion years, then for reasonable parameters a typical observer should expect their vacuum to have a life-time of approximately 12 billion years. This prediction is model dependent, but may point toward a solution to the coincidence problem of cosmology.
Clifton Timothy
Shenker Stephen
Sivanandam Navin
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