A peek outside our universe

Enrique Gaztanaga; Pablo Fosalba

doi:10.3390/sym14020285

A peek outside our universe

Enrique Gaztanaga^*, Pablo Fosalba

^*Corresponding author for this work

Institute of Cosmology & Gravitation

Research output: Contribution to journal › Article › peer-review

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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
Article number	285
Number of pages	6
Journal	Symmetry
Volume	14
Issue number	2
DOIs	https://doi.org/10.3390/sym14020285
Publication status	Published - 31 Jan 2022

Keywords

Black holes
Cosmology
Dark energy
General relativity

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A peek outside our universeFinal published version, 911 KBLicence: CC BY

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title = "A peek outside our universe",

abstract = "According to general relativity (GR), a universe with a cosmological constant ΛΛ, like ours, is trapped inside an event horizon, 푟<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.",

keywords = "Black holes, Cosmology, Dark energy, General relativity",

author = "Enrique Gaztanaga and Pablo Fosalba",

note = "Funding Information: Funding: This work has been supported by Spanish MINECO grants PGC2018-102021 and ESP2017-89838-C3-1-R and EU grants LACEGAL 734374 and EWC 776247 with ERDF funds and grant 2017-SGR-885 of the Generalitat de Catalunya. Publisher Copyright: {\textcopyright} 2022 by the authors. Licensee MDPI, Basel, Switzerland.",

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doi = "10.3390/sym14020285",

language = "English",

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AU - Gaztanaga, Enrique

AU - Fosalba, Pablo

N1 - Funding Information: Funding: This work has been supported by Spanish MINECO grants PGC2018-102021 and ESP2017-89838-C3-1-R and EU grants LACEGAL 734374 and EWC 776247 with ERDF funds and grant 2017-SGR-885 of the Generalitat de Catalunya. Publisher Copyright: © 2022 by the authors. Licensee MDPI, Basel, Switzerland.

PY - 2022/1/31

Y1 - 2022/1/31

N2 - According to general relativity (GR), a universe with a cosmological constant ΛΛ, like ours, is trapped inside an event horizon, 푟<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.

AB - According to general relativity (GR), a universe with a cosmological constant ΛΛ, like ours, is trapped inside an event horizon, 푟<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.

KW - Black holes

KW - Cosmology

KW - Dark energy

KW - General relativity

UR - https://www.scopus.com/pages/publications/85124473425

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DO - 10.3390/sym14020285

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JO - Symmetry

JF - Symmetry

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ER -

A peek outside our universe

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Keywords

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