Ghost Dark Energy in the DGP Braneworld
We investigate the ghost model of dark energy in the framework of DGP braneworld. We explore the cosmological consequences of this model by determining the equation of state parameter, ωD, the deceleration, and the density parameters. We also examine the stability of this model by studying the squar...
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| Format: | Article |
| Language: | English |
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Wiley
2018-01-01
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| Series: | Advances in High Energy Physics |
| Online Access: | http://dx.doi.org/10.1155/2018/2514927 |
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| author | M. Abdollahi Zadeh A. Sheykhi |
| author_facet | M. Abdollahi Zadeh A. Sheykhi |
| author_sort | M. Abdollahi Zadeh |
| collection | DOAJ |
| description | We investigate the ghost model of dark energy in the framework of DGP braneworld. We explore the cosmological consequences of this model by determining the equation of state parameter, ωD, the deceleration, and the density parameters. We also examine the stability of this model by studying the squared of the sound speed in the presence/absence of interaction term between dark energy and dark matter. We find out that in the absence of interaction between two dark sectors of the universe we have ωD→-1 in the late time, while in the presence of interaction ωD can cross the phantom line -1. In both cases the squared of sound speed vs2 does not show any signal of stability. We also determine the statefinder diagnosis of this model as well as the ωD-ωD′ plane and compare the results with the ΛCDM model. We find that ωD-ωD′ plane meets the freezing region in the absence of interaction between two dark sectors, while it meets both the thawing and the freezing regions in the interacting case. |
| format | Article |
| id | doaj-art-70b00d1ce7e646fc9fd63dabf18eca2f |
| institution | OA Journals |
| issn | 1687-7357 1687-7365 |
| language | English |
| publishDate | 2018-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in High Energy Physics |
| spelling | doaj-art-70b00d1ce7e646fc9fd63dabf18eca2f2025-08-20T02:06:47ZengWileyAdvances in High Energy Physics1687-73571687-73652018-01-01201810.1155/2018/25149272514927Ghost Dark Energy in the DGP BraneworldM. Abdollahi Zadeh0A. Sheykhi1Physics Department and Biruni Observatory, College of Sciences, Shiraz University, Shiraz 71454, IranPhysics Department and Biruni Observatory, College of Sciences, Shiraz University, Shiraz 71454, IranWe investigate the ghost model of dark energy in the framework of DGP braneworld. We explore the cosmological consequences of this model by determining the equation of state parameter, ωD, the deceleration, and the density parameters. We also examine the stability of this model by studying the squared of the sound speed in the presence/absence of interaction term between dark energy and dark matter. We find out that in the absence of interaction between two dark sectors of the universe we have ωD→-1 in the late time, while in the presence of interaction ωD can cross the phantom line -1. In both cases the squared of sound speed vs2 does not show any signal of stability. We also determine the statefinder diagnosis of this model as well as the ωD-ωD′ plane and compare the results with the ΛCDM model. We find that ωD-ωD′ plane meets the freezing region in the absence of interaction between two dark sectors, while it meets both the thawing and the freezing regions in the interacting case.http://dx.doi.org/10.1155/2018/2514927 |
| spellingShingle | M. Abdollahi Zadeh A. Sheykhi Ghost Dark Energy in the DGP Braneworld Advances in High Energy Physics |
| title | Ghost Dark Energy in the DGP Braneworld |
| title_full | Ghost Dark Energy in the DGP Braneworld |
| title_fullStr | Ghost Dark Energy in the DGP Braneworld |
| title_full_unstemmed | Ghost Dark Energy in the DGP Braneworld |
| title_short | Ghost Dark Energy in the DGP Braneworld |
| title_sort | ghost dark energy in the dgp braneworld |
| url | http://dx.doi.org/10.1155/2018/2514927 |
| work_keys_str_mv | AT mabdollahizadeh ghostdarkenergyinthedgpbraneworld AT asheykhi ghostdarkenergyinthedgpbraneworld |