Cosmological singularities in conformal Weyl gravity
Abstract In this work, we study the issue of the past and future cosmological singularities in the context of the fourth-order conformal Weyl gravity. In particular, we investigate the emergent universe scenario proposed by Ellis et al., and find the stability conditions of the corresponding Einstei...
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| Format: | Article |
| Language: | English |
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SpringerOpen
2019-11-01
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| Series: | European Physical Journal C: Particles and Fields |
| Online Access: | http://link.springer.com/article/10.1140/epjc/s10052-019-7446-4 |
| _version_ | 1818339496733704192 |
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| author | Yaghoub Heydarzade |
| author_facet | Yaghoub Heydarzade |
| author_sort | Yaghoub Heydarzade |
| collection | DOAJ |
| description | Abstract In this work, we study the issue of the past and future cosmological singularities in the context of the fourth-order conformal Weyl gravity. In particular, we investigate the emergent universe scenario proposed by Ellis et al., and find the stability conditions of the corresponding Einstein static state using the fixed point approach. We show that depending on the values of the parameters of the conformal Weyl gravity theory, there are possibilities for having initially stable emergent states for an FRW universe with both the positive and negative spatial curvatures. This represents that the conformal Weyl gravity can be free of the initial singularity problem. Then, following Barrow et al., we address the possible types of the finite-time future cosmological singularities. We discuss how these singularities also can be avoided in the context of this theory. |
| first_indexed | 2024-12-13T15:27:56Z |
| format | Article |
| id | doaj.art-31e7c01b593f45ce943b1559d048ce10 |
| institution | Directory Open Access Journal |
| issn | 1434-6044 1434-6052 |
| language | English |
| last_indexed | 2024-12-13T15:27:56Z |
| publishDate | 2019-11-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | European Physical Journal C: Particles and Fields |
| spelling | doaj.art-31e7c01b593f45ce943b1559d048ce102022-12-21T23:40:16ZengSpringerOpenEuropean Physical Journal C: Particles and Fields1434-60441434-60522019-11-01791111110.1140/epjc/s10052-019-7446-4Cosmological singularities in conformal Weyl gravityYaghoub Heydarzade0Department of Mathematics, Faculty of Sciences, Bilkent UniversityAbstract In this work, we study the issue of the past and future cosmological singularities in the context of the fourth-order conformal Weyl gravity. In particular, we investigate the emergent universe scenario proposed by Ellis et al., and find the stability conditions of the corresponding Einstein static state using the fixed point approach. We show that depending on the values of the parameters of the conformal Weyl gravity theory, there are possibilities for having initially stable emergent states for an FRW universe with both the positive and negative spatial curvatures. This represents that the conformal Weyl gravity can be free of the initial singularity problem. Then, following Barrow et al., we address the possible types of the finite-time future cosmological singularities. We discuss how these singularities also can be avoided in the context of this theory.http://link.springer.com/article/10.1140/epjc/s10052-019-7446-4 |
| spellingShingle | Yaghoub Heydarzade Cosmological singularities in conformal Weyl gravity European Physical Journal C: Particles and Fields |
| title | Cosmological singularities in conformal Weyl gravity |
| title_full | Cosmological singularities in conformal Weyl gravity |
| title_fullStr | Cosmological singularities in conformal Weyl gravity |
| title_full_unstemmed | Cosmological singularities in conformal Weyl gravity |
| title_short | Cosmological singularities in conformal Weyl gravity |
| title_sort | cosmological singularities in conformal weyl gravity |
| url | http://link.springer.com/article/10.1140/epjc/s10052-019-7446-4 |
| work_keys_str_mv | AT yaghoubheydarzade cosmologicalsingularitiesinconformalweylgravity |