Modified Einstein-Gauss-Bonnet gravity: Riemann-Cartan and pseudo-Riemannian cases

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dc.contributor.authorOzer, Hatice
dc.contributor.authorBaykal, Ahmet
dc.contributor.authorDelice, Ozgur
dc.date.accessioned2019-08-01T13:38:39Z
dc.date.available2019-08-01T13:38:39Z
dc.date.issued2016
dc.departmentNiğde ÖHÜ
dc.description.abstractA modified Einstein-Gauss-Bonnet gravity in four dimensions where the quadratic Gauss-Bonnet term is coupled to a scalar field is considered. The field equations of the model are obtained by variational methods by making use of the constrained first-order formalism covering both pseudo-Riemannian and non-Riemannian cases. In the pseudo-Riemannian case, the Lagrange multiplier forms, which impose the vanishing torsion constraint, are eliminated in favor of the remaining fields and the resulting metric field equations are expressed in terms of the double dual curvature 2-form. In the non-Riemannian case with torsion, the field equations are expressed in terms of the pseudo-Riemannian quantities by a perturbative scheme valid for a weak coupling constant. It is shown that, for both cases, the model admits a maximally symmetric de Sitter solution with non-trivial scalar field. Minimal coupling of a Dirac spinor to the Gauss-Bonnet modified gravity is also discussed briefly.
dc.identifier.doi10.1140/epjp/i2016-16290-4
dc.identifier.issn2190-5444
dc.identifier.issue8
dc.identifier.scopus2-s2.0-84983789337
dc.identifier.scopusqualityQ2
dc.identifier.urihttps://dx.doi.org/10.1140/epjp/i2016-16290-4
dc.identifier.urihttps://hdl.handle.net/11480/3585
dc.identifier.volume131
dc.identifier.wosWOS:000382366800003
dc.identifier.wosqualityQ2
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.institutionauthor[0-Belirlenecek]
dc.language.isoen
dc.publisherSPRINGER HEIDELBERG
dc.relation.ispartofEUROPEAN PHYSICAL JOURNAL PLUS
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.titleModified Einstein-Gauss-Bonnet gravity: Riemann-Cartan and pseudo-Riemannian cases
dc.typeArticle

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