No-boundary measure of the universe.
No-boundary measure of the universe.
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宇宙的无边界测量。
DOI：
10.1103/physrevlett.100.201301
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发表时间：
2007
影响因子：
8.6
通讯作者：
T. Hertog
中科院分区：
文献类型：
--
作者：
J. Hartle;S. Hawking;T. Hertog
我们考虑了具有宇宙学常数和具有二次势的标量场的齐次各向同性闭合宇宙的无边界方案。在半经典极限中，如果标量场足够大，它可以预测后期的经典行为。经典历史可能在过去是单一的，也可能在有限的半径内反弹。这个概率度量选择通货膨胀历史，但偏向于少量的e折叠N。然而，为了获得我们在过去光锥中观察到的概率，这些概率应该乘以exp(3N)。这一体积权重类似于永久通货膨胀中的权重。在景观潜力中，它将预测宇宙经历了大量的膨胀，可能一直是半经典的。
We consider the no-boundary proposal for homogeneous isotropic closed universes with a cosmological constant and a scalar field with a quadratic potential. In the semiclassical limit, it predicts classical behavior at late times if the scalar field is large enough. The classical histories may be singular in the past or bounce at a finite radius. This probability measure selects inflationary histories but is biased towards small numbers of e-foldings N. However, to obtain the probability of our observations in our past light cone these probabilities should be multiplied by exp(3N). This volume weighting is similar to that in eternal inflation. In a landscape potential, it would predict that the Universe underwent a large amount of inflation and could have always been semiclassical.