Creation Field Cosmological Model with Variable Cosmological Term (Λ) in Bianchi Type III Space-Time
The paper is devoted to the study of cosmological models with time-varying cosmological term (Λ) in the presence of creation field in the framework of Bianchi type III space-time. To obtain deterministic model of the universe, we have assumed Λ∝1/R3, where R is the scale factor, for steady state cos...
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| Format: | Article |
| Language: | English |
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Wiley
2024-01-01
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| Series: | Advances in High Energy Physics |
| Online Access: | http://dx.doi.org/10.1155/2024/5901224 |
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| author | Raj Bali Seema Saraf |
| author_facet | Raj Bali Seema Saraf |
| author_sort | Raj Bali |
| collection | DOAJ |
| description | The paper is devoted to the study of cosmological models with time-varying cosmological term (Λ) in the presence of creation field in the framework of Bianchi type III space-time. To obtain deterministic model of the universe, we have assumed Λ∝1/R3, where R is the scale factor, for steady state cosmology and creation field, and shear (σ) is proportion to expansion (θ) which leads to B=Cn, where B and C are the metric potentials to explain small anisotropic behaviour of the universe and its isotropy. To obtain the results in terms of cosmic time t, we have assumed n=2. The model satisfies conservation equations, and creation field increases with time. The present model is free from singularity, has particle horizon, and provides a natural explanation for inflationary scenario and isotropization. Creation field and Einstein field equations are derived using principle of least action and Lagrangian formulation of variable cosmological term. For illustrative purposes, evolutionary behaviour of some cosmological parameters are shown graphically. The other physical aspects like accelerating behaviour of the model are also discussed. Thus, the model represents not only expanding universe but also accelerating which matches with the results of present-day observations. |
| format | Article |
| id | doaj-art-afdc4b47f12f43e3a9591dd12752b939 |
| institution | Kabale University |
| issn | 1687-7365 |
| language | English |
| publishDate | 2024-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in High Energy Physics |
| spelling | doaj-art-afdc4b47f12f43e3a9591dd12752b9392025-08-20T03:39:18ZengWileyAdvances in High Energy Physics1687-73652024-01-01202410.1155/2024/5901224Creation Field Cosmological Model with Variable Cosmological Term (Λ) in Bianchi Type III Space-TimeRaj Bali0Seema Saraf1Department of MathematicsDepartment of MathematicsThe paper is devoted to the study of cosmological models with time-varying cosmological term (Λ) in the presence of creation field in the framework of Bianchi type III space-time. To obtain deterministic model of the universe, we have assumed Λ∝1/R3, where R is the scale factor, for steady state cosmology and creation field, and shear (σ) is proportion to expansion (θ) which leads to B=Cn, where B and C are the metric potentials to explain small anisotropic behaviour of the universe and its isotropy. To obtain the results in terms of cosmic time t, we have assumed n=2. The model satisfies conservation equations, and creation field increases with time. The present model is free from singularity, has particle horizon, and provides a natural explanation for inflationary scenario and isotropization. Creation field and Einstein field equations are derived using principle of least action and Lagrangian formulation of variable cosmological term. For illustrative purposes, evolutionary behaviour of some cosmological parameters are shown graphically. The other physical aspects like accelerating behaviour of the model are also discussed. Thus, the model represents not only expanding universe but also accelerating which matches with the results of present-day observations.http://dx.doi.org/10.1155/2024/5901224 |
| spellingShingle | Raj Bali Seema Saraf Creation Field Cosmological Model with Variable Cosmological Term (Λ) in Bianchi Type III Space-Time Advances in High Energy Physics |
| title | Creation Field Cosmological Model with Variable Cosmological Term (Λ) in Bianchi Type III Space-Time |
| title_full | Creation Field Cosmological Model with Variable Cosmological Term (Λ) in Bianchi Type III Space-Time |
| title_fullStr | Creation Field Cosmological Model with Variable Cosmological Term (Λ) in Bianchi Type III Space-Time |
| title_full_unstemmed | Creation Field Cosmological Model with Variable Cosmological Term (Λ) in Bianchi Type III Space-Time |
| title_short | Creation Field Cosmological Model with Variable Cosmological Term (Λ) in Bianchi Type III Space-Time |
| title_sort | creation field cosmological model with variable cosmological term λ in bianchi type iii space time |
| url | http://dx.doi.org/10.1155/2024/5901224 |
| work_keys_str_mv | AT rajbali creationfieldcosmologicalmodelwithvariablecosmologicaltermlinbianchitypeiiispacetime AT seemasaraf creationfieldcosmologicalmodelwithvariablecosmologicaltermlinbianchitypeiiispacetime |