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arXiv 1001.4590gr-qcastro-ph.CO
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关于永恒暴胀中无穷大的注记

A Note on Infinities in Eternal Inflation

George F. R. Ellis, William R. Stoeger

摘要:

在Vilenkin及其同事开发的一些著名的开放宇宙永恒膨胀的场景中,大量的宇宙在永恒膨胀的大宇宙中成核和热化。根据这个提议,每个宇宙都在一个点上成核,因此成核宇宙的边界是一个类似空间的表面,几乎与从成核点发出的未来光锥重合,所有点都有相同的真时。这使作者得出结论,在适当的时间t = t_{nuc},在任何这样的成核发生,一个无限的开放宇宙开始存在。我们指出,这完全是由于假设的成核发生在一个单一的点,这在量子宇宙学的光似乎很难支持。即使是在成核时刻的无限小的类空长度也会给出一个相当不同的结果--成核宇宙的边界在适当的时间内演化,只有在无限的时间内才变成无限。所谓的无限永远不会在任何有限的时间达到。

英文摘要:

In some well-known scenarios of open-universe eternal inflation, developed by Vilenkin and co-workers, a large number of universes nucleate and thermalize within the eternally inflating mega-universe. According to the proposal, each universe nucleates at a point, and therefore the boundary of the nucleated universe is a space-like surface nearly coincident with the future light cone emanating from the point of nucleation, all points of which have the same proper-time. This leads the authors to conclude that at the proper-time t = t_{nuc} at which any such nucleation occurs, an infinite open universe comes into existence. We point out that this is due entirely to the supposition of the nucleation occurring at a single point, which in light of quantum cosmology seems difficult to support. Even an infinitesimal space-like length at the moment of nucleation gives a rather different result -- the boundary of the nucleating universe evolves in proper-time and becomes infinite only in an infinite time. The alleged infinity is never attained at any finite time.

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