The Cosmological Constant as Event Horizon
General Relativity allows for a cosmological constant (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi mathvariant="sans-serif">Λ</mi></semantics></math></inline-formula>) w...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-02-01
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| Series: | Symmetry |
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| Online Access: | https://www.mdpi.com/2073-8994/14/2/300 |
| _version_ | 1797476449269055488 |
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| author | Enrique Gaztanaga |
| author_facet | Enrique Gaztanaga |
| author_sort | Enrique Gaztanaga |
| collection | DOAJ |
| description | General Relativity allows for a cosmological constant (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi mathvariant="sans-serif">Λ</mi></semantics></math></inline-formula>) which has inspired models of cosmic Inflation and Dark Energy. We show instead that <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>r</mi><mi mathvariant="sans-serif">Λ</mi></msub><mo>=</mo><msqrt><mrow><mn>3</mn><mo>/</mo><mi mathvariant="sans-serif">Λ</mi></mrow></msqrt></mrow></semantics></math></inline-formula> corresponds to an event horizon: a causal boundary term in the action. Our Universe is expanding inside its Schwarzschild radius <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>r</mi><mi>S</mi></msub><mo>=</mo><msub><mi>r</mi><mi mathvariant="sans-serif">Λ</mi></msub><mo>=</mo><mn>2</mn><mi>G</mi><mi>M</mi></mrow></semantics></math></inline-formula>, which could have originated from a uniform free falling cloud of mass <i>M</i> that collapsed as a Black Hole (BH) 25 Gyrs ago. Such a BH Universe allows for large-scale structure formation without the need of Inflation or Dark Energy. |
| first_indexed | 2024-03-09T20:57:59Z |
| format | Article |
| id | doaj.art-fe3499180eb9458b8944946b2b6ed41a |
| institution | Directory Open Access Journal |
| issn | 2073-8994 |
| language | English |
| last_indexed | 2024-03-09T20:57:59Z |
| publishDate | 2022-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Symmetry |
| spelling | doaj.art-fe3499180eb9458b8944946b2b6ed41a2023-11-23T22:16:24ZengMDPI AGSymmetry2073-89942022-02-0114230010.3390/sym14020300The Cosmological Constant as Event HorizonEnrique Gaztanaga0Institute of Space Sciences (ICE, CSIC), 08193 Barcelona, SpainGeneral Relativity allows for a cosmological constant (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi mathvariant="sans-serif">Λ</mi></semantics></math></inline-formula>) which has inspired models of cosmic Inflation and Dark Energy. We show instead that <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>r</mi><mi mathvariant="sans-serif">Λ</mi></msub><mo>=</mo><msqrt><mrow><mn>3</mn><mo>/</mo><mi mathvariant="sans-serif">Λ</mi></mrow></msqrt></mrow></semantics></math></inline-formula> corresponds to an event horizon: a causal boundary term in the action. Our Universe is expanding inside its Schwarzschild radius <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>r</mi><mi>S</mi></msub><mo>=</mo><msub><mi>r</mi><mi mathvariant="sans-serif">Λ</mi></msub><mo>=</mo><mn>2</mn><mi>G</mi><mi>M</mi></mrow></semantics></math></inline-formula>, which could have originated from a uniform free falling cloud of mass <i>M</i> that collapsed as a Black Hole (BH) 25 Gyrs ago. Such a BH Universe allows for large-scale structure formation without the need of Inflation or Dark Energy.https://www.mdpi.com/2073-8994/14/2/300cosmologyDark Energygeneral relativityblack holes |
| spellingShingle | Enrique Gaztanaga The Cosmological Constant as Event Horizon Symmetry cosmology Dark Energy general relativity black holes |
| title | The Cosmological Constant as Event Horizon |
| title_full | The Cosmological Constant as Event Horizon |
| title_fullStr | The Cosmological Constant as Event Horizon |
| title_full_unstemmed | The Cosmological Constant as Event Horizon |
| title_short | The Cosmological Constant as Event Horizon |
| title_sort | cosmological constant as event horizon |
| topic | cosmology Dark Energy general relativity black holes |
| url | https://www.mdpi.com/2073-8994/14/2/300 |
| work_keys_str_mv | AT enriquegaztanaga thecosmologicalconstantaseventhorizon AT enriquegaztanaga cosmologicalconstantaseventhorizon |