Gravitational Collapse and Singularity Removal in Rastall Theory
In the present work, we study spherically symmetric gravitational collapse of a homogeneous fluid in the framework of Rastall gravity. Considering a nonlinear equation of state (EoS) for the fluid profiles, we search for a class of nonsingular collapse solutions and the possibility of singularity re...
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| Format: | Article |
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Wiley
2021-01-01
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| Series: | Advances in High Energy Physics |
| Online Access: | http://dx.doi.org/10.1155/2021/6638827 |
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| author | Ehsan Dorrani |
| author_facet | Ehsan Dorrani |
| author_sort | Ehsan Dorrani |
| collection | DOAJ |
| description | In the present work, we study spherically symmetric gravitational collapse of a homogeneous fluid in the framework of Rastall gravity. Considering a nonlinear equation of state (EoS) for the fluid profiles, we search for a class of nonsingular collapse solutions and the possibility of singularity removal. We find that depending on the model parameters, the collapse scenario halts at a minimum value of the scale factor at which a bounce occurs. The collapse process then enters an expanding phase in the postbounce regime, and consequently the formation of a spacetime singularity is prevented. We also find that, in comparison to the singular case where the apparent horizon forms to cover the singularity, the formation of apparent horizon can be delayed allowing thus the bounce to be causally connected to the external universe. The nonsingular solutions we obtain satisfy the weak energy condition (WEC) which is crucial for physical validity of the model. |
| format | Article |
| id | doaj-art-0c9be398b4cc4e29ba1d90d39e685ca4 |
| institution | Kabale University |
| issn | 1687-7357 1687-7365 |
| language | English |
| publishDate | 2021-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in High Energy Physics |
| spelling | doaj-art-0c9be398b4cc4e29ba1d90d39e685ca42025-02-03T06:43:28ZengWileyAdvances in High Energy Physics1687-73571687-73652021-01-01202110.1155/2021/66388276638827Gravitational Collapse and Singularity Removal in Rastall TheoryEhsan Dorrani0Department of Physics, Kahnooj Branch, Islamic Azad University, Kahnooj, IranIn the present work, we study spherically symmetric gravitational collapse of a homogeneous fluid in the framework of Rastall gravity. Considering a nonlinear equation of state (EoS) for the fluid profiles, we search for a class of nonsingular collapse solutions and the possibility of singularity removal. We find that depending on the model parameters, the collapse scenario halts at a minimum value of the scale factor at which a bounce occurs. The collapse process then enters an expanding phase in the postbounce regime, and consequently the formation of a spacetime singularity is prevented. We also find that, in comparison to the singular case where the apparent horizon forms to cover the singularity, the formation of apparent horizon can be delayed allowing thus the bounce to be causally connected to the external universe. The nonsingular solutions we obtain satisfy the weak energy condition (WEC) which is crucial for physical validity of the model.http://dx.doi.org/10.1155/2021/6638827 |
| spellingShingle | Ehsan Dorrani Gravitational Collapse and Singularity Removal in Rastall Theory Advances in High Energy Physics |
| title | Gravitational Collapse and Singularity Removal in Rastall Theory |
| title_full | Gravitational Collapse and Singularity Removal in Rastall Theory |
| title_fullStr | Gravitational Collapse and Singularity Removal in Rastall Theory |
| title_full_unstemmed | Gravitational Collapse and Singularity Removal in Rastall Theory |
| title_short | Gravitational Collapse and Singularity Removal in Rastall Theory |
| title_sort | gravitational collapse and singularity removal in rastall theory |
| url | http://dx.doi.org/10.1155/2021/6638827 |
| work_keys_str_mv | AT ehsandorrani gravitationalcollapseandsingularityremovalinrastalltheory |