A cosmological model with time dependent Λ, G and viscous fluid in general relativity
In this paper, we investigate Bianchi type − V cosmological models with bulk viscous fluid and time varying cosmological Λ and Newtonian G parameters. The Einstein’s field equations have been transformed into a coupling non-linear, first-order differential equations, and the fourth-order Runge-Kutta...
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| Format: | Article |
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Frontiers Media S.A.
2022-08-01
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| Series: | Frontiers in Astronomy and Space Sciences |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fspas.2022.965652/full |
| _version_ | 1811315594342957056 |
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| author | Rishi Kumar Tiwari Alnadhief H. A. Alfedeel Değer Sofuoğlu Amare Abebe Amare Abebe Eltegani I. Hassan B. K. Shukla |
| author_facet | Rishi Kumar Tiwari Alnadhief H. A. Alfedeel Değer Sofuoğlu Amare Abebe Amare Abebe Eltegani I. Hassan B. K. Shukla |
| author_sort | Rishi Kumar Tiwari |
| collection | DOAJ |
| description | In this paper, we investigate Bianchi type − V cosmological models with bulk viscous fluid and time varying cosmological Λ and Newtonian G parameters. The Einstein’s field equations have been transformed into a coupling non-linear, first-order differential equations, and the fourth-order Runge-Kutta method of numerical integration has been used to integrate the differential equations with appropriate initial conditions consistent with current cosmological observations. We show that the model describes a universe that starts off with a negative cosmological term, as well as a matter-dominated and decelerated early epoch that, eventually becomes Λ-dominated and expanding with acceleration, in concordance with current observations. |
| first_indexed | 2024-04-13T11:34:04Z |
| format | Article |
| id | doaj.art-8cb3f9b4fc12427d801acdf02f2027df |
| institution | Directory Open Access Journal |
| issn | 2296-987X |
| language | English |
| last_indexed | 2024-04-13T11:34:04Z |
| publishDate | 2022-08-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Astronomy and Space Sciences |
| spelling | doaj.art-8cb3f9b4fc12427d801acdf02f2027df2022-12-22T02:48:30ZengFrontiers Media S.A.Frontiers in Astronomy and Space Sciences2296-987X2022-08-01910.3389/fspas.2022.965652965652A cosmological model with time dependent Λ, G and viscous fluid in general relativityRishi Kumar Tiwari0Alnadhief H. A. Alfedeel1Değer Sofuoğlu2Amare Abebe3Amare Abebe4Eltegani I. Hassan5B. K. Shukla6Department of Mathematics, Govt. Model Science College Rewa, Rewa, Madhya Pradesh, IndiaDepartment of Mathematics and Statistics, Imam Mohammad Ibn Saud Islamic University (IMSIU), Riyadh, Saudi ArabiaDepartment of Physics, Istanbul University, Instanbul, TurkeyCenter for Space Research, North-West University, Mahikeng, South AfricaNational Institute for Theoretical and Computational Sciences (NITheCS), Cape Town, South AfricaDepartment of Mathematics and Statistics, Imam Mohammad Ibn Saud Islamic University (IMSIU), Riyadh, Saudi ArabiaDepartment of Mathematics, Govt. Model Science College Rewa, Rewa, Madhya Pradesh, IndiaIn this paper, we investigate Bianchi type − V cosmological models with bulk viscous fluid and time varying cosmological Λ and Newtonian G parameters. The Einstein’s field equations have been transformed into a coupling non-linear, first-order differential equations, and the fourth-order Runge-Kutta method of numerical integration has been used to integrate the differential equations with appropriate initial conditions consistent with current cosmological observations. We show that the model describes a universe that starts off with a negative cosmological term, as well as a matter-dominated and decelerated early epoch that, eventually becomes Λ-dominated and expanding with acceleration, in concordance with current observations.https://www.frontiersin.org/articles/10.3389/fspas.2022.965652/fulltime dependent G and ∧bianchi metricviscous fluidanisotropycosmological parameter |
| spellingShingle | Rishi Kumar Tiwari Alnadhief H. A. Alfedeel Değer Sofuoğlu Amare Abebe Amare Abebe Eltegani I. Hassan B. K. Shukla A cosmological model with time dependent Λ, G and viscous fluid in general relativity Frontiers in Astronomy and Space Sciences time dependent G and ∧ bianchi metric viscous fluid anisotropy cosmological parameter |
| title | A cosmological model with time dependent Λ, G and viscous fluid in general relativity |
| title_full | A cosmological model with time dependent Λ, G and viscous fluid in general relativity |
| title_fullStr | A cosmological model with time dependent Λ, G and viscous fluid in general relativity |
| title_full_unstemmed | A cosmological model with time dependent Λ, G and viscous fluid in general relativity |
| title_short | A cosmological model with time dependent Λ, G and viscous fluid in general relativity |
| title_sort | cosmological model with time dependent λ g and viscous fluid in general relativity |
| topic | time dependent G and ∧ bianchi metric viscous fluid anisotropy cosmological parameter |
| url | https://www.frontiersin.org/articles/10.3389/fspas.2022.965652/full |
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