The distribution of Omega_k from the scale-factor cutoff measure
The distribution of Omega_k from the scale-factor cutoff measure
复制标题
来自比例因子截止测量的 Omega_k 分布
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
Michael P. Salem
中科院分区：
文献类型：
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作者：
A. Simone;Michael P. Salem
我们的宇宙可能包含在一系列发散的气泡中，这些气泡在一个永远膨胀的多元宇宙中成核。调节这种多元宇宙发散时空体积的一个有希望的措施是标度因子截止，它的一个特征是，气泡不会因为慢滚膨胀持续时间更长而获得回报。因此，根据像我们这样的气泡中膨胀e折叠次数的横向分布，我们可能希望测量时空曲率。我们研究了最近提出的地貌中的一个卡通膨胀模型，发现我们宇宙中的曲率很有可能(大约10%)远远高于宇宙变化的期望值。人为选择不会强烈地选择像观测到的那样小的曲率(相对较大的值)，这意味着可以使用曲率的观测界限来排除通常产生太小膨胀的景观模型。
Our universe may be contained in one among a diverging number of bubbles that nucleate within an eternally inflating multiverse. 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. Thus, depending on the landscape distribution of the number of e-folds of inflation among bubbles like ours, we might hope to measure spacetime curvature. We study a recently proposed cartoon model of inflation in the landscape and find a reasonable chance (about ten percent) that the curvature in our universe is well above the value expected from cosmic variance. 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.
影响因子：
8.7
作者：
Komatsu, E.;Smith, K. M.;Wright, E. L.
通讯作者：
Wright, E. L.