Negative vacuum energy densities and the causal diamond measure

Details Negative vacuum energy densities and the causal diamond measure Negative vacuum energy densities and the causal diamond measure

2009-02-25

arxiv.org/abs/0902.4485v3

Phys.Rev.D80:023502,2009

Physics

High Energy Physics

High Energy Physics - Theory

9 pages, 3 figures; v2: minor error fixed (results essentially unchanged), reference added; v3: published version, includes a

Scientific paper

10.1103/PhysRevD.80.023502

Arguably a major success of the landscape picture is the prediction of a small, non-zero vacuum energy density. The details of this prediction depends in part on how the diverging spacetime volume of the multiverse is regulated, a question that remains unresolved. One proposal, the causal diamond measure, has demonstrated many phenomenological successes, including predicting a distribution of positive vacuum energy densities in good agreement with observation. In the string landscape, however, the vacuum energy density is expected to take positive and negative values. We find the causal diamond measure gives a poor fit to observation in such a landscape -- in particular, 99.6% of observers in galaxies seemingly just like ours measure a vacuum energy density smaller than we do, most of them measuring it to be negative.

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