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dc.contributor.authorKarahan, Canan Nurhan
dc.contributor.authorDoğangün, Oktay
dc.contributor.authorDemir, Durmuş Ali
dc.date.accessioned2017-05-29T06:34:28Z
dc.date.available2017-05-29T06:34:28Z
dc.date.issued2012-08
dc.identifier.citationKarahan, C. N., Doğangün, O. and Demir, D. A. (2012). Conformal transformations in metric-affine gravity and ghosts. Annalen der Physik, 524(8), 461-469. doi:10.1002/andp.201200003en_US
dc.identifier.issn0003-3804
dc.identifier.urihttp://dx.doi.org/10.1002/andp.201200003
dc.identifier.urihttp://hdl.handle.net/11147/5619
dc.description.abstractConformal transformations play a widespread role in gravity theories in regard to their cosmological and other implications. In the pure metric theory of gravity, conformal transformations change the frame to a new one wherein one obtains a conformal-invariant scalar-tensor theory such that the scalar field, deriving from the conformal factor, is a ghost. In this work, conformal transformations and ghosts will be analyzed in the framework of the metric-affine theory of gravity. Within this framework, metric and connection are independent variables, and, hence, transform independently under conformal transformations. It will be shown that, if affine connection is invariant under conformal transformations, then the scalar field of concern is a non-ghost, non-dynamical field. It is an auxiliary field at the classical level, and might develop a kinetic term at the quantum level. Alternatively, if connection transforms additively with a structure similar to yet more general than that of the Levi-Civita connection, the resulting action describes the gravitational dynamics correctly, and, more importantly, the scalar field becomes a dynamical non-ghost field. The equations of motion, for generic geometrical and matter-sector variables, do not reduce connection to the Levi-Civita connection, and, hence, independence of connection from metric is maintained. Therefore, metric-affine gravity provides an arena in which ghosts arising from the conformal factor are avoided thanks to the independence of connection from the metric.en_US
dc.language.isoengen_US
dc.publisherWiley-VCH Verlagen_US
dc.relation.isversionof10.1002/andp.201200003en_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectMetric-affine gravityen_US
dc.subjectConformal mappingen_US
dc.subjectConformal transformationsen_US
dc.subjectGhostsen_US
dc.titleConformal transformations in metric-affine gravity and ghostsen_US
dc.typearticleen_US
dc.contributor.authorIDTR1918en_US
dc.contributor.institutionauthorKarahan, Canan Nurhan
dc.contributor.institutionauthorDemir, Durmuş Ali
dc.relation.journalAnnalen der Physiken_US
dc.contributor.departmentİYTE, Fen Fakültesi, Fizik Bölümüen_US
dc.identifier.volume524en_US
dc.identifier.issue8en_US
dc.identifier.startpage461en_US
dc.identifier.endpage469en_US
dc.identifier.wosWOS:000307445500017
dc.identifier.scopusSCOPUS:2-s2.0-84865087188
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US


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