Study of QCD generalized ghost dark energy in FRW universe
Abstract A phenomenological generalized ghost dark energy model has been studied under the framework of FRW universe. In ghost dark energy model the energy density depends linearly on Hubble parameter (H) but in this dark energy model, the energy density contains a the sub-leading term which is depe...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2019-08-01
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| Series: | European Physical Journal C: Particles and Fields |
| Online Access: | http://link.springer.com/article/10.1140/epjc/s10052-019-7147-z |
| _version_ | 1819013075849707520 |
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| author | Mahasweta Biswas Ujjal Debnath Shounak Ghosh B. K. Guha |
| author_facet | Mahasweta Biswas Ujjal Debnath Shounak Ghosh B. K. Guha |
| author_sort | Mahasweta Biswas |
| collection | DOAJ |
| description | Abstract A phenomenological generalized ghost dark energy model has been studied under the framework of FRW universe. In ghost dark energy model the energy density depends linearly on Hubble parameter (H) but in this dark energy model, the energy density contains a the sub-leading term which is depends on $$\mathcal {O} (H^2)$$ O(H2) , so the energy density takes the form $$\rho _D=\alpha H+ \beta H^2$$ ρD=αH+βH2 , where $$\alpha $$ α and $$\beta $$ β are the constants. The solutions of the Friedman equation of our model leads to a stable universe. We have fitted our model with the present observational data including Stern data set. With the help of best fit results we find the adiabatic sound speed remains positive throughout the cosmic evolution, that claims the stability of the model. The flipping of the signature of deceleration parameter at the value of scale factor $$a=0.5$$ a=0.5 indicates that the universe is at the stage of acceleration i.e. de Sitter phase of the universe at late time. Our model shows that the acceleration of the universe begin at redshift $$z_{ace}\approx 0.617$$ zace≈0.617 and the model is also consistent with the current observational data. |
| first_indexed | 2024-12-21T01:54:11Z |
| format | Article |
| id | doaj.art-e1f28c9f3ba84d52ba39ecb22c5c4930 |
| institution | Directory Open Access Journal |
| issn | 1434-6044 1434-6052 |
| language | English |
| last_indexed | 2024-12-21T01:54:11Z |
| publishDate | 2019-08-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | European Physical Journal C: Particles and Fields |
| spelling | doaj.art-e1f28c9f3ba84d52ba39ecb22c5c49302022-12-21T19:19:49ZengSpringerOpenEuropean Physical Journal C: Particles and Fields1434-60441434-60522019-08-017981910.1140/epjc/s10052-019-7147-zStudy of QCD generalized ghost dark energy in FRW universeMahasweta Biswas0Ujjal Debnath1Shounak Ghosh2B. K. Guha3Department of Mathematics, Indian Institute of Engineering Science and Technology, ShibpurDepartment of Mathematics, Indian Institute of Engineering Science and Technology, ShibpurDepartment of Physics, Indian Institute of Engineering Science and Technology, ShibpurDepartment of Physics, Indian Institute of Engineering Science and Technology, ShibpurAbstract A phenomenological generalized ghost dark energy model has been studied under the framework of FRW universe. In ghost dark energy model the energy density depends linearly on Hubble parameter (H) but in this dark energy model, the energy density contains a the sub-leading term which is depends on $$\mathcal {O} (H^2)$$ O(H2) , so the energy density takes the form $$\rho _D=\alpha H+ \beta H^2$$ ρD=αH+βH2 , where $$\alpha $$ α and $$\beta $$ β are the constants. The solutions of the Friedman equation of our model leads to a stable universe. We have fitted our model with the present observational data including Stern data set. With the help of best fit results we find the adiabatic sound speed remains positive throughout the cosmic evolution, that claims the stability of the model. The flipping of the signature of deceleration parameter at the value of scale factor $$a=0.5$$ a=0.5 indicates that the universe is at the stage of acceleration i.e. de Sitter phase of the universe at late time. Our model shows that the acceleration of the universe begin at redshift $$z_{ace}\approx 0.617$$ zace≈0.617 and the model is also consistent with the current observational data.http://link.springer.com/article/10.1140/epjc/s10052-019-7147-z |
| spellingShingle | Mahasweta Biswas Ujjal Debnath Shounak Ghosh B. K. Guha Study of QCD generalized ghost dark energy in FRW universe European Physical Journal C: Particles and Fields |
| title | Study of QCD generalized ghost dark energy in FRW universe |
| title_full | Study of QCD generalized ghost dark energy in FRW universe |
| title_fullStr | Study of QCD generalized ghost dark energy in FRW universe |
| title_full_unstemmed | Study of QCD generalized ghost dark energy in FRW universe |
| title_short | Study of QCD generalized ghost dark energy in FRW universe |
| title_sort | study of qcd generalized ghost dark energy in frw universe |
| url | http://link.springer.com/article/10.1140/epjc/s10052-019-7147-z |
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