Generalized Phenomenological Models of Dark Energy
It was first observed at the end of the last century that the universe is presently accelerating. Ever since, there have been several attempts to explain this observation theoretically. There are two possible approaches. The more conventional one is to modify the matter part of the Einstein field eq...
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| Format: | Article |
| Language: | English |
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Wiley
2020-01-01
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| Series: | Advances in High Energy Physics |
| Online Access: | http://dx.doi.org/10.1155/2020/5249839 |
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| author | Prasenjit Paul Rikpratik Sengupta |
| author_facet | Prasenjit Paul Rikpratik Sengupta |
| author_sort | Prasenjit Paul |
| collection | DOAJ |
| description | It was first observed at the end of the last century that the universe is presently accelerating. Ever since, there have been several attempts to explain this observation theoretically. There are two possible approaches. The more conventional one is to modify the matter part of the Einstein field equations, and the second one is to modify the geometry part. We shall consider two phenomenological models based on the former, more conventional approach within the context of general relativity. The phenomenological models in this paper consider a Λ term firstly a function of a¨/a and secondly a function of ρ, where a and ρ are the scale factor and matter energy density, respectively. Constraining the free parameters of the models with the latest observational data gives satisfactory values of parameters as considered by us initially. Without any field theoretic interpretation, we explain the recent observations with a dynamical cosmological constant. |
| format | Article |
| id | doaj-art-f3492f8db7744460b929e41d0d073085 |
| institution | Kabale University |
| issn | 1687-7357 1687-7365 |
| language | English |
| publishDate | 2020-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in High Energy Physics |
| spelling | doaj-art-f3492f8db7744460b929e41d0d0730852025-02-03T01:04:19ZengWileyAdvances in High Energy Physics1687-73571687-73652020-01-01202010.1155/2020/52498395249839Generalized Phenomenological Models of Dark EnergyPrasenjit Paul0Rikpratik Sengupta1Department of Physics, Indian Institute of Engineering Science and Technology, Shibpur, IndiaDepartment of Physics, Government College of Engineering and Ceramic Technology, Kolkata, 700010 West Bengal, IndiaIt was first observed at the end of the last century that the universe is presently accelerating. Ever since, there have been several attempts to explain this observation theoretically. There are two possible approaches. The more conventional one is to modify the matter part of the Einstein field equations, and the second one is to modify the geometry part. We shall consider two phenomenological models based on the former, more conventional approach within the context of general relativity. The phenomenological models in this paper consider a Λ term firstly a function of a¨/a and secondly a function of ρ, where a and ρ are the scale factor and matter energy density, respectively. Constraining the free parameters of the models with the latest observational data gives satisfactory values of parameters as considered by us initially. Without any field theoretic interpretation, we explain the recent observations with a dynamical cosmological constant.http://dx.doi.org/10.1155/2020/5249839 |
| spellingShingle | Prasenjit Paul Rikpratik Sengupta Generalized Phenomenological Models of Dark Energy Advances in High Energy Physics |
| title | Generalized Phenomenological Models of Dark Energy |
| title_full | Generalized Phenomenological Models of Dark Energy |
| title_fullStr | Generalized Phenomenological Models of Dark Energy |
| title_full_unstemmed | Generalized Phenomenological Models of Dark Energy |
| title_short | Generalized Phenomenological Models of Dark Energy |
| title_sort | generalized phenomenological models of dark energy |
| url | http://dx.doi.org/10.1155/2020/5249839 |
| work_keys_str_mv | AT prasenjitpaul generalizedphenomenologicalmodelsofdarkenergy AT rikpratiksengupta generalizedphenomenologicalmodelsofdarkenergy |