Researcher:
Yetişmişoğlu, Cem

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Phd Student

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Cem

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Yetişmişoğlu

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Yetişmişoğlu, Cem

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2019 - 201922020 - 20222

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Researcher Of Publications: search.filters.isAuthorOfPublication.c2516d33-0d63-468f-8341-28ec98bc7a84

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Now showing 1 - 4 of 4
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    A model of non-minimally coupled gravitation and electromagnetism in (1+2) dimensions
    (IOP Publishing Ltd, 2022) Ünlütürk, Kıvanç İbrahim; Yetişmişoğlu, Cem; PhD Student; Phd Student; Graduate School of Sciences and Engineering; Graduate School of Sciences and Engineering; N/A; N/A
    Following earlier works of Dereli and collaborators, we study a three dimensional toy model where we extend the topologically massive gravity with electrodynamics by the most general RF 2-type non-minimal coupling terms. Here R denotes the possible curvature terms and F denotes the electromagnetic 2-form. We derive the variational feld equations and look for exact solutions on constant negative curvature space-times with a constant, self-dual electromagnetic feld. The notion of self-dual electromagnetic felds in three dimensions is introduced by Dereli and collaborators in the study of exact solutions of models with gravity-electromagnetism couplings. We note the conditions that the parameters of the model have to satisfy for these self-dual solutions to exist.
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    PublicationOpen Access
    Weyl covariant theories of gravity in 3-dimensional Riemann-Cartan-Weyl space-times
    (Institute of Physics (IOP) Publishing, 2019) Department of Physics; Dereli, Tekin; Yetişmişoğlu, Cem; Phd Student; Department of Physics; College of Sciences; Graduate School of Sciences and Engineering; 201358; N/A
    We discuss locally Weyl (scale) covariant generalisations of gravitational theories using Riemann-Cartan-Weyl space-times in arbitrary dimensions. We illustrate the procedure of Weyl gauging for three examples: general relativity, topologically massive gravity and minimal massive gravity theories in three dimensions. Afterwards, we demonstrate the consistency of scale covariant generalisation by showing that the scale covariant theories contain the original theories in their vacuum configuration for their Weyl sector.
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    PublicationOpen Access
    The variational field equations of cosmological topologically massive supergravity
    (Wiley, 2021) Department of Physics; Dereli, Tekin; Yetişmişoğlu, Cem; Phd Student; Department of Physics; College of Sciences; Graduate School of Sciences and Engineering; 201358; N/A
    We discuss the formulation of cosmological topologically massive (simple) supergravity theory in three-dimensional Riemann-Cartan space-times. We use the language of exterior differential forms and the properties of Majorana spinors on 3-dimensional space-times to explicitly demonstrate the local supersymmetry of the action density involved. Exact coupled field equations that are complete in both of their bosonic and fermionic sectors are derived by a first order variational principle subject to a torsion-constraint imposed by the method of Lagrange multipliers. Cotton and Cottino 2-forms that are complete to all orders in the gravitino field are derived and their properties such as trace are investigated.
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    PublicationOpen Access
    Weyl covariant quadratic curvature gravity in three-dimensional Riemann-Cartan-Weyl spacetimes
    (American Physical Society (APS), 2019) Department of Physics; Dereli, Tekin; Yetişmişoğlu, Cem; Phd Student; Department of Physics; College of Sciences; Graduate School of Sciences and Engineering; 201358; N/A
    We discuss locally Weyl (scale) covariant generalization of quadratic curvature gravity theory in three dimensions using Riemann-Cartan-Weyl spacetimes. We show that this procedure of Weyl gauging yields a consistent generalization for a particular class of quadratic curvature gravity theories which includes the new massive gravity theory.