Late Time Acceleration of the Universe from Quantum Gravity
We show that the accelerating expansion phase of the universe can emerge from the group field theory formalism, a candidate theory of quantum gravity. The cosmological evolution can be extracted from condensate states using the mean field approximation, in a form of modified FLRW equations. By intro...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-03-01
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| Series: | Universe |
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| Online Access: | https://www.mdpi.com/2218-1997/8/3/163 |
| _version_ | 1797441315952132096 |
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| author | Xiankai Pang |
| author_facet | Xiankai Pang |
| author_sort | Xiankai Pang |
| collection | DOAJ |
| description | We show that the accelerating expansion phase of the universe can emerge from the group field theory formalism, a candidate theory of quantum gravity. The cosmological evolution can be extracted from condensate states using the mean field approximation, in a form of modified FLRW equations. By introducing an effective equation of state <i>w</i>, we can reveal the relevant features of the evolution and show that, with the proper choice of the parameters, <i>w</i> will approach <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mo>−</mo><mn>1</mn></mrow></semantics></math></inline-formula>, leading to an accelerating phase dominated by the cosmological constant effectively. |
| first_indexed | 2024-03-09T12:21:16Z |
| format | Article |
| id | doaj.art-dd395ab637084f3b8b715bd16a540b0a |
| institution | Directory Open Access Journal |
| issn | 2218-1997 |
| language | English |
| last_indexed | 2024-03-09T12:21:16Z |
| publishDate | 2022-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Universe |
| spelling | doaj.art-dd395ab637084f3b8b715bd16a540b0a2023-11-30T22:40:40ZengMDPI AGUniverse2218-19972022-03-018316310.3390/universe8030163Late Time Acceleration of the Universe from Quantum GravityXiankai Pang0Arnold-Sommerfeld-Center for Theoretical Physics, Ludwig-Maximilians-Universität, Theresienstraße 37, 80333 Müchen, GermanyWe show that the accelerating expansion phase of the universe can emerge from the group field theory formalism, a candidate theory of quantum gravity. The cosmological evolution can be extracted from condensate states using the mean field approximation, in a form of modified FLRW equations. By introducing an effective equation of state <i>w</i>, we can reveal the relevant features of the evolution and show that, with the proper choice of the parameters, <i>w</i> will approach <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mo>−</mo><mn>1</mn></mrow></semantics></math></inline-formula>, leading to an accelerating phase dominated by the cosmological constant effectively.https://www.mdpi.com/2218-1997/8/3/163dark energy theoryquantum cosmologyquantum gravity phenomenology |
| spellingShingle | Xiankai Pang Late Time Acceleration of the Universe from Quantum Gravity Universe dark energy theory quantum cosmology quantum gravity phenomenology |
| title | Late Time Acceleration of the Universe from Quantum Gravity |
| title_full | Late Time Acceleration of the Universe from Quantum Gravity |
| title_fullStr | Late Time Acceleration of the Universe from Quantum Gravity |
| title_full_unstemmed | Late Time Acceleration of the Universe from Quantum Gravity |
| title_short | Late Time Acceleration of the Universe from Quantum Gravity |
| title_sort | late time acceleration of the universe from quantum gravity |
| topic | dark energy theory quantum cosmology quantum gravity phenomenology |
| url | https://www.mdpi.com/2218-1997/8/3/163 |
| work_keys_str_mv | AT xiankaipang latetimeaccelerationoftheuniversefromquantumgravity |