Mimetic Gravity: A Review of Recent Developments and Applications to Cosmology and Astrophysics
Mimetic gravity is a Weyl-symmetric extension of General Relativity, related to the latter by a singular disformal transformation, wherein the appearance of a dust-like perfect fluid can mimic cold dark matter at a cosmological level. Within this framework, it is possible to provide a unified geomet...
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| Format: | Article |
| Language: | English |
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Wiley
2017-01-01
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| Series: | Advances in High Energy Physics |
| Online Access: | http://dx.doi.org/10.1155/2017/3156915 |
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| _version_ | 1832550261205237760 |
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| author | Lorenzo Sebastiani Sunny Vagnozzi Ratbay Myrzakulov |
| author_facet | Lorenzo Sebastiani Sunny Vagnozzi Ratbay Myrzakulov |
| author_sort | Lorenzo Sebastiani |
| collection | DOAJ |
| description | Mimetic gravity is a Weyl-symmetric extension of General Relativity, related to the latter by a singular disformal transformation, wherein the appearance of a dust-like perfect fluid can mimic cold dark matter at a cosmological level. Within this framework, it is possible to provide a unified geometrical explanation for dark matter, the late-time acceleration, and inflation, making it a very attractive theory. In this review, we summarize the main aspects of mimetic gravity, as well as extensions of the minimal formulation of the model. We devote particular focus to the reconstruction technique, which allows the realization of any desired expansionary history of the universe by an accurate choice of potential or other functions defined within the theory (as in the case of mimetic f(R) gravity). We briefly discuss cosmological perturbation theory within mimetic gravity. As a case study within which we apply the concepts previously discussed, we study a mimetic Hořava-like theory, of which we explore solutions and cosmological perturbations in detail. Finally, we conclude the review by discussing static spherically symmetric solutions within mimetic gravity and apply our findings to the problem of galactic rotation curves. Our review provides an introduction to mimetic gravity, as well as a concise but self-contained summary of recent findings, progress, open questions, and outlooks on future research directions. |
| format | Article |
| id | doaj-art-1e75b812c68e40fca1b47746e1f1eb50 |
| institution | Kabale University |
| issn | 1687-7357 1687-7365 |
| language | English |
| publishDate | 2017-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in High Energy Physics |
| spelling | doaj-art-1e75b812c68e40fca1b47746e1f1eb502025-02-03T06:07:07ZengWileyAdvances in High Energy Physics1687-73571687-73652017-01-01201710.1155/2017/31569153156915Mimetic Gravity: A Review of Recent Developments and Applications to Cosmology and AstrophysicsLorenzo Sebastiani0Sunny Vagnozzi1Ratbay Myrzakulov2Department of General & Theoretical Physics and Eurasian Center for Theoretical Physics, Eurasian National University, Satpayev Str. 2, Astana 010008, KazakhstanNiels Bohr Institute, University of Copenhagen, Blegdamsvej 17, 2100 København Ø, DenmarkDepartment of General & Theoretical Physics and Eurasian Center for Theoretical Physics, Eurasian National University, Satpayev Str. 2, Astana 010008, KazakhstanMimetic gravity is a Weyl-symmetric extension of General Relativity, related to the latter by a singular disformal transformation, wherein the appearance of a dust-like perfect fluid can mimic cold dark matter at a cosmological level. Within this framework, it is possible to provide a unified geometrical explanation for dark matter, the late-time acceleration, and inflation, making it a very attractive theory. In this review, we summarize the main aspects of mimetic gravity, as well as extensions of the minimal formulation of the model. We devote particular focus to the reconstruction technique, which allows the realization of any desired expansionary history of the universe by an accurate choice of potential or other functions defined within the theory (as in the case of mimetic f(R) gravity). We briefly discuss cosmological perturbation theory within mimetic gravity. As a case study within which we apply the concepts previously discussed, we study a mimetic Hořava-like theory, of which we explore solutions and cosmological perturbations in detail. Finally, we conclude the review by discussing static spherically symmetric solutions within mimetic gravity and apply our findings to the problem of galactic rotation curves. Our review provides an introduction to mimetic gravity, as well as a concise but self-contained summary of recent findings, progress, open questions, and outlooks on future research directions.http://dx.doi.org/10.1155/2017/3156915 |
| spellingShingle | Lorenzo Sebastiani Sunny Vagnozzi Ratbay Myrzakulov Mimetic Gravity: A Review of Recent Developments and Applications to Cosmology and Astrophysics Advances in High Energy Physics |
| title | Mimetic Gravity: A Review of Recent Developments and Applications to Cosmology and Astrophysics |
| title_full | Mimetic Gravity: A Review of Recent Developments and Applications to Cosmology and Astrophysics |
| title_fullStr | Mimetic Gravity: A Review of Recent Developments and Applications to Cosmology and Astrophysics |
| title_full_unstemmed | Mimetic Gravity: A Review of Recent Developments and Applications to Cosmology and Astrophysics |
| title_short | Mimetic Gravity: A Review of Recent Developments and Applications to Cosmology and Astrophysics |
| title_sort | mimetic gravity a review of recent developments and applications to cosmology and astrophysics |
| url | http://dx.doi.org/10.1155/2017/3156915 |
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