Bouncing Cosmology in Fourth-Order Gravity
The Big Bang initial singularity problem can be solved by means of bouncing solutions. In the context of extended theories of gravity, we will look for covariant effective actions whose field equations contain up to fourth-order derivatives of the metric tensor. In finding such bouncing solutions, w...
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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/2218-1997/8/3/161 |
| _version_ | 1827625064112062464 |
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| author | Marcello Miranda Daniele Vernieri Salvatore Capozziello Francisco S. N. Lobo |
| author_facet | Marcello Miranda Daniele Vernieri Salvatore Capozziello Francisco S. N. Lobo |
| author_sort | Marcello Miranda |
| collection | DOAJ |
| description | The Big Bang initial singularity problem can be solved by means of bouncing solutions. In the context of extended theories of gravity, we will look for covariant effective actions whose field equations contain up to fourth-order derivatives of the metric tensor. In finding such bouncing solutions, we will make use of an order reduction technique based on a perturbative approach. Reducing the order of the field equations to second-order, we are able to find solutions which are perturbatively close to General Relativity. We will build the covariant effective actions of the resulting order reduced theories. |
| first_indexed | 2024-03-09T12:21:23Z |
| format | Article |
| id | doaj.art-fb0be079df1b4779b18d1922b4c0ecd0 |
| institution | Directory Open Access Journal |
| issn | 2218-1997 |
| language | English |
| last_indexed | 2024-03-09T12:21:23Z |
| publishDate | 2022-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Universe |
| spelling | doaj.art-fb0be079df1b4779b18d1922b4c0ecd02023-11-30T22:40:38ZengMDPI AGUniverse2218-19972022-03-018316110.3390/universe8030161Bouncing Cosmology in Fourth-Order GravityMarcello Miranda0Daniele Vernieri1Salvatore Capozziello2Francisco S. N. Lobo3Scuola Superiore Meridionale, Largo San Marcellino 10, 80138 Napoli, ItalyINFN Sez. di Napoli, Complesso Universitario di Monte Sant’Angelo, Edificio G, Via Cinthia, 80126 Napoli, ItalyScuola Superiore Meridionale, Largo San Marcellino 10, 80138 Napoli, ItalyInstituto de Astrofísica e Ciências do Espaco, Faculdade de Ciências da Universidade de Lisboa, Edifício C8, Campo Grande, 1749-016 Lisbon, PortugalThe Big Bang initial singularity problem can be solved by means of bouncing solutions. In the context of extended theories of gravity, we will look for covariant effective actions whose field equations contain up to fourth-order derivatives of the metric tensor. In finding such bouncing solutions, we will make use of an order reduction technique based on a perturbative approach. Reducing the order of the field equations to second-order, we are able to find solutions which are perturbatively close to General Relativity. We will build the covariant effective actions of the resulting order reduced theories.https://www.mdpi.com/2218-1997/8/3/161extended theories of gravitybouncing cosmologyorder reduction |
| spellingShingle | Marcello Miranda Daniele Vernieri Salvatore Capozziello Francisco S. N. Lobo Bouncing Cosmology in Fourth-Order Gravity Universe extended theories of gravity bouncing cosmology order reduction |
| title | Bouncing Cosmology in Fourth-Order Gravity |
| title_full | Bouncing Cosmology in Fourth-Order Gravity |
| title_fullStr | Bouncing Cosmology in Fourth-Order Gravity |
| title_full_unstemmed | Bouncing Cosmology in Fourth-Order Gravity |
| title_short | Bouncing Cosmology in Fourth-Order Gravity |
| title_sort | bouncing cosmology in fourth order gravity |
| topic | extended theories of gravity bouncing cosmology order reduction |
| url | https://www.mdpi.com/2218-1997/8/3/161 |
| work_keys_str_mv | AT marcellomiranda bouncingcosmologyinfourthordergravity AT danielevernieri bouncingcosmologyinfourthordergravity AT salvatorecapozziello bouncingcosmologyinfourthordergravity AT franciscosnlobo bouncingcosmologyinfourthordergravity |