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arXiv 2104.00521gr-qcastro-ph.COhep-th
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我们宇宙之外的一瞥

A peek outside our Universe

Enrique Gaztanaga, Pablo Fosalba

摘要:

根据广义相对论(GR),一个宇宙学常数为$Λ$的宇宙,就像我们的宇宙一样,被困在一个事件视界$r< \sqrt{3/Λ}$中。外面是什么?我们用Israel(1967)的结条件证明了,外面可能有一个不同的宇宙。我们的宇宙在外部观察者看来就像一个黑洞。向外辐射的零测地线无法逃离我们的宇宙,但入射的光子可以进入并在我们的CMB天空留下印记。我们提出了这样一个化石记录的图片,从CMB地图的分析,同意黑洞宇宙的预测,但挑战我们的原始宇宙的起源的理解。

英文摘要:

According to general relativity (GR), a universe with a cosmological constant $Λ$, like ours, is trapped inside an event horizon, $r< \sqrt{3/Λ}$. What is outside? We show, using Israel (1967) junction conditions, that there could be a different universe outside. Our universe looks like a black hole for an outside observer. Outgoing radial null geodesics cannot escape our universe, but incoming photons can enter and leave an imprint on our CMB sky. We present a picture of such a fossil record from the analysis of CMB maps that agrees with the black hole universe predictions but challenges our understanding of the origin of the primordial universe.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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