Conformal cylindrically symmetric spacetimes in modified gravity

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dc.contributor.authorTurkoglu, Murat Metehan
dc.contributor.authorDogru, Melis Ulu
dc.date.accessioned2025-01-27T20:48:03Z
dc.date.available2025-01-27T20:48:03Z
dc.date.issued2015
dc.departmentÇanakkale Onsekiz Mart Üniversitesi
dc.description.abstractWe investigate cylindrically symmetric spacetimes in the context of f(R) gravity. We firstly attain conformal symmetry of the cylindrically symmetric spacetime. We obtain solutions to use features of the conformal symmetry, field equations and their solutions for cylindrically symmetric spacetime filled with various cosmic matters such as vacuum state, perfect fluid, anisotropic fluid, massive scalar field and their combinations. With the vacuum state solutions, we show that source of the spacetime curvature is considered as Casimir effect. Casimir force for given spacetime is found using Wald's axiomatic analysis. We expose that the Casimir force for Boulware, Hartle-Hawking and Unruh vacuum states could have attractive, repulsive and ineffective features. In the perfect fluid state, we show that matter form of the perfect fluid in given spacetime must only be dark energy. Also, we offer that potential of massive and massless scalar field are developed as an exact solution from the modified field equations. All solutions of field equations for vacuum case, perfect fluid and scalar field give a special f(R) function convenient to Lambda-CDM model. In addition to these solutions, we introduce conformal cylindrical symmetric solutions in the cases of different f(R) models. Finally, geometrical and physical results of the solutions are discussed.
dc.identifier.doi10.1142/S0217732315502028
dc.identifier.issn0217-7323
dc.identifier.issn1793-6632
dc.identifier.issue37
dc.identifier.scopus2-s2.0-84947603633
dc.identifier.scopusqualityQ2
dc.identifier.urihttps://doi.org/10.1142/S0217732315502028
dc.identifier.urihttps://hdl.handle.net/20.500.12428/25126
dc.identifier.volume30
dc.identifier.wosWOS:000365984600005
dc.identifier.wosqualityQ3
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherWorld Scientific Publ Co Pte Ltd
dc.relation.ispartofModern Physics Letters A
dc.relation.publicationcategoryinfo:eu-repo/semantics/openAccess
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.snmzKA_WoS_20250125
dc.subjectModified gravity
dc.subjectconformal symmetry
dc.subjectCasimir effect
dc.subjectvacuum state
dc.subjectperfect fluid
dc.subjectanisotropic fluid
dc.subjectscalar field
dc.titleConformal cylindrically symmetric spacetimes in modified gravity
dc.typeArticle

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