Predicting the cosmological constant with the scale-factor cutoff measure

Simple item page
dc.creatorDe Simone, Andrea
dc.creatorGuth, Alan H.
dc.creatorSalem, Michael P.
dc.creatorVilenkin, Alexander
dc.date2008-05-15
dc.date.accessioned2026-07-07T12:44:35Z
dc.date.available2026-07-07T12:44:35Z
dc.descriptionIt 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.
dc.description16 pages, 6 figures, 2 appendices
dc.identifierhttps://arxiv.org/abs/0805.2173
dc.identifierhttp://arxiv.org/abs/0805.2173
dc.identifierPhys.Rev.D78:063520,2008
dc.identifierdoi:10.1103/PhysRevD.78.063520
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/220821
dc.subjectHigh Energy Physics - Theory
dc.subjectAstrophysics
dc.subjectHigh Energy Physics - Phenomenology
dc.titlePredicting the cosmological constant with the scale-factor cutoff measure
dc.typetext

Files

Collections

arXiv