Predicting the cosmological constant with the scale-factor cutoff measure

Details Predicting the cosmological constant with the scale-factor cutoff measure Predicting the cosmological constant with the scale-factor cutoff measure

2008-05-15

arxiv.org/abs/0805.2173v1

Phys.Rev.D78:063520,2008

Physics

High Energy Physics

High Energy Physics - Theory

16 pages, 6 figures, 2 appendices

Scientific paper

10.1103/PhysRevD.78.063520

It is well known that anthropic selection from a landscape with a flat prior distribution of cosmological constant Lambda gives a reasonable fit to observation. However, a realistic model of the multiverse has a physical volume that diverges with time, and the predicted distribution of Lambda depends on how the spacetime volume is regulated. We study a simple model of the multiverse with probabilities regulated by a scale-factor cutoff, and calculate the resulting distribution, considering both positive and negative values of Lambda. The results are in good agreement with observation. In particular, the scale-factor cutoff strongly suppresses the probability for values of Lambda that are more than about ten times the observed value. We also discuss several qualitative features of the scale-factor cutoff, including aspects of the distributions of the curvature parameter Omega and the primordial density contrast Q.

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