Toy Models of Universe with an Effective Varying Λ-Term in Lyra Manifold
Research on the accelerated expansion of our Universe captures a lot of attention. The dark energy (DE) is a way to explain it. In this paper we will consider scalar field quintessence DE with ωDE>-1 EoS, where the dynamics of the DE models related to the dynamics of the scalar field. We are inte...
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| Format: | Article |
| Language: | English |
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Wiley
2015-01-01
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| Series: | Advances in High Energy Physics |
| Online Access: | http://dx.doi.org/10.1155/2015/796168 |
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| author | Martiros Khurshudyan |
| author_facet | Martiros Khurshudyan |
| author_sort | Martiros Khurshudyan |
| collection | DOAJ |
| description | Research on the accelerated expansion of our Universe captures a lot of attention. The dark energy (DE) is a way to explain it. In this paper we will consider scalar field quintessence DE with ωDE>-1 EoS, where the dynamics of the DE models related to the dynamics of the scalar field. We are interested in the study of the behavior of the Universe in the presence of interacting quintessence DE models in Lyra manifold with a varying Λt. In a considered framework we also would like to propose a new form for Λt. We found that the models correspond to the transit Universe, which will enter the accelerated expansion phase and will remain there with a constant deceleration parameter q. We found also that the Λt is a decreasing function which takes a small positive value with Ωm≠0 and ΩQ→const dominating Ωm in the old Universe. Observational constraints are applied and causality issue via CS2 is discussed as a possible way to either reject or accept the models. |
| format | Article |
| id | doaj-art-4497c164483d45f596a115c93d148d92 |
| institution | Kabale University |
| issn | 1687-7357 1687-7365 |
| language | English |
| publishDate | 2015-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in High Energy Physics |
| spelling | doaj-art-4497c164483d45f596a115c93d148d922025-02-03T01:02:19ZengWileyAdvances in High Energy Physics1687-73571687-73652015-01-01201510.1155/2015/796168796168Toy Models of Universe with an Effective Varying Λ-Term in Lyra ManifoldMartiros Khurshudyan0Max Planck Institute of Colloids and Interfaces, Potsdam-Golm Science Park, Am Muhlenberg 1 OT Golm, 14476 Potsdam, GermanyResearch on the accelerated expansion of our Universe captures a lot of attention. The dark energy (DE) is a way to explain it. In this paper we will consider scalar field quintessence DE with ωDE>-1 EoS, where the dynamics of the DE models related to the dynamics of the scalar field. We are interested in the study of the behavior of the Universe in the presence of interacting quintessence DE models in Lyra manifold with a varying Λt. In a considered framework we also would like to propose a new form for Λt. We found that the models correspond to the transit Universe, which will enter the accelerated expansion phase and will remain there with a constant deceleration parameter q. We found also that the Λt is a decreasing function which takes a small positive value with Ωm≠0 and ΩQ→const dominating Ωm in the old Universe. Observational constraints are applied and causality issue via CS2 is discussed as a possible way to either reject or accept the models.http://dx.doi.org/10.1155/2015/796168 |
| spellingShingle | Martiros Khurshudyan Toy Models of Universe with an Effective Varying Λ-Term in Lyra Manifold Advances in High Energy Physics |
| title | Toy Models of Universe with an Effective Varying Λ-Term in Lyra Manifold |
| title_full | Toy Models of Universe with an Effective Varying Λ-Term in Lyra Manifold |
| title_fullStr | Toy Models of Universe with an Effective Varying Λ-Term in Lyra Manifold |
| title_full_unstemmed | Toy Models of Universe with an Effective Varying Λ-Term in Lyra Manifold |
| title_short | Toy Models of Universe with an Effective Varying Λ-Term in Lyra Manifold |
| title_sort | toy models of universe with an effective varying λ term in lyra manifold |
| url | http://dx.doi.org/10.1155/2015/796168 |
| work_keys_str_mv | AT martiroskhurshudyan toymodelsofuniversewithaneffectivevaryinglterminlyramanifold |