Four-volume cutoff measure of the multiverse
Four-volume cutoff measure of the multiverse
复制标题
多元宇宙的四卷截止测量
DOI:
10.1103/physrevd.101.043520
复制
发表时间:
2020
影响因子:
5
通讯作者:
Yamada, Masaki
中科院分区:
文献类型:
--
作者:
Vilenkin, Alexander;Yamada, Masaki
Predictions in an eternally inflating multiverse are meaningless unless we specify the probability measure. The scale-factor cutoff is perhaps the simplest and most successful measure which avoids catastrophic problems such as the youngness paradox, runaway problem, and Boltzmann brain problem, but it is not well defined in contracting regions with a negative cosmological constant. In this paper, we propose a new measure with properties similar to the scale-factor cutoff which is well-defined everywhere. The measure is defined by a cutoff in the four volume spanned by infinitesimal comoving neighborhoods in a congruence of timelike geodesics. The probability distributions for the cosmological constant and for the curvature parameter in this measure are similar to those for the scale-factor cutoff and are in a good agreement with observations.
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DOI:
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发表时间:
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期刊:
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