![]() To make predictions for an eternally inflating 'multiverse', one must adopt a procedure for regulating its divergent spacetime volume. Anthropic selection does not strongly select for curvature as small as is observed (relative somewhat larger values), meaning the observational bound on curvature can be used to rule out landscape models that typically give too little inflation.« lessīoltzmann brains and the scale- factor cutoff measure of the multiverseĭe Simone, Andrea Guth, Alan H. We study a recently proposed cartoon model of inflation in the landscape and find a reasonable chance (about 10%) that the curvaturemore » in our Universe is well above the value expected from cosmic variance. Thus, depending on the landscape distribution of the number of e-folds of inflation among bubbles like ours, we might hope to measure spatial curvature. A promising measure to regulate the diverging spacetime volume of such a multiverse is the scale- factor cutoff, one feature of which is bubbles are not rewarded for having a longer duration of slow-roll inflation. Our Universe may be contained in one among a diverging number of bubbles that nucleate within an eternally inflating multiverse. ![]() ![]() It is well known that anthropic selection from a landscape with a flat prior distribution of cosmological constant from the scale- factor cutoff measure Predicting the cosmological constant with the scale- factor cutoff measureĭOE Office of Scientific and Technical Information (OSTI.GOV)ĭe Simone, Andrea Guth, Alan H.
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