To Conserve, or Not to Conserve: A Review of Nonconservative Theories of Gravity
Apart from the familiar structure firmly-rooted in the general relativistic field equations where the energy–momentum tensor has a null divergence i.e., it conserves, there exists a considerable number of extended theories of gravity allowing departures from the usual conservative framework. Many of...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-02-01
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| Series: | Universe |
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| Online Access: | https://www.mdpi.com/2218-1997/7/2/38 |
| _version_ | 1797414641784061952 |
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| author | Hermano Velten Thiago R. P. Caramês |
| author_facet | Hermano Velten Thiago R. P. Caramês |
| author_sort | Hermano Velten |
| collection | DOAJ |
| description | Apart from the familiar structure firmly-rooted in the general relativistic field equations where the energy–momentum tensor has a null divergence i.e., it conserves, there exists a considerable number of extended theories of gravity allowing departures from the usual conservative framework. Many of these theories became popular in the last few years, aiming to describe the phenomenology behind dark matter and dark energy. However, within these scenarios, it is common to see attempts to preserve the conservative property of the energy–momentum tensor. Most of the time, it is done by means of some additional constraint that ensures the validity of the standard conservation law, as long as this option is available in the theory. However, if no such extra constraint is available, the theory will inevitably carry a non-trivial conservation law as part of its structure. In this work, we review some of such proposals discussing the theoretical construction leading to the non-conservation of the energy–momentum tensor. |
| first_indexed | 2024-03-09T05:36:21Z |
| format | Article |
| id | doaj.art-279a058db55640da8839e72d4f8a3075 |
| institution | Directory Open Access Journal |
| issn | 2218-1997 |
| language | English |
| last_indexed | 2024-03-09T05:36:21Z |
| publishDate | 2021-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Universe |
| spelling | doaj.art-279a058db55640da8839e72d4f8a30752023-12-03T12:28:03ZengMDPI AGUniverse2218-19972021-02-01723810.3390/universe7020038To Conserve, or Not to Conserve: A Review of Nonconservative Theories of GravityHermano Velten0Thiago R. P. Caramês1Departamento de Física, Universidade Federal de Ouro Preto (UFOP), Ouro Preto 35400-000, Minas Gerais, BrazilDepartamento de Física, Universidade Federal de Lavras (UFLA), Lavras 37200-000, Minas Gerais, BrazilApart from the familiar structure firmly-rooted in the general relativistic field equations where the energy–momentum tensor has a null divergence i.e., it conserves, there exists a considerable number of extended theories of gravity allowing departures from the usual conservative framework. Many of these theories became popular in the last few years, aiming to describe the phenomenology behind dark matter and dark energy. However, within these scenarios, it is common to see attempts to preserve the conservative property of the energy–momentum tensor. Most of the time, it is done by means of some additional constraint that ensures the validity of the standard conservation law, as long as this option is available in the theory. However, if no such extra constraint is available, the theory will inevitably carry a non-trivial conservation law as part of its structure. In this work, we review some of such proposals discussing the theoretical construction leading to the non-conservation of the energy–momentum tensor.https://www.mdpi.com/2218-1997/7/2/38general relativitycosmologyextended theories of gravity |
| spellingShingle | Hermano Velten Thiago R. P. Caramês To Conserve, or Not to Conserve: A Review of Nonconservative Theories of Gravity Universe general relativity cosmology extended theories of gravity |
| title | To Conserve, or Not to Conserve: A Review of Nonconservative Theories of Gravity |
| title_full | To Conserve, or Not to Conserve: A Review of Nonconservative Theories of Gravity |
| title_fullStr | To Conserve, or Not to Conserve: A Review of Nonconservative Theories of Gravity |
| title_full_unstemmed | To Conserve, or Not to Conserve: A Review of Nonconservative Theories of Gravity |
| title_short | To Conserve, or Not to Conserve: A Review of Nonconservative Theories of Gravity |
| title_sort | to conserve or not to conserve a review of nonconservative theories of gravity |
| topic | general relativity cosmology extended theories of gravity |
| url | https://www.mdpi.com/2218-1997/7/2/38 |
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