Abstract
According to general relativity (GR), a universe with a cosmological constant ΛΛ, like ours, is trapped inside an event horizon, 𝑟<3/Λ−−−−√�<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.
Original language | English |
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Article number | 285 |
Number of pages | 6 |
Journal | Symmetry |
Volume | 14 |
Issue number | 2 |
DOIs | |
Publication status | Published - 31 Jan 2022 |
Keywords
- Black holes
- Cosmology
- Dark energy
- General relativity