Yazar "Demir, Emre" seçeneğine göre listele

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    Investigating physical existence of charged stellar models
    (Elsevier B.V., 2024) Demir, Emre; Naseer, Tayyab; Ashraf, Asifa; Güdekli, Ertan
    This study aims at the detailed exploration of the internal structure of various anisotropic star configurations interacting with an electromagnetic field within the framework of f(R,T,Q) theory of gravity. We, specifically, consider a standard form of this theory in this regard, represented by a linear function of the Ricci scalar and the factor Q. Our analysis adopts a spherically symmetric, charged metric to describe the internal structure of dense quark models and proceeds to derive the field equations which correspond to the considered scenario. These equations are subsequently solved utilizing the particular metric potentials as well as the bag model. We then adopt the empirical data, specifically the radii and masses, from two quark stars including SMC X-4 and SAX J 1808.4-3658 to investigate the impact of charge and modified correction terms on their physical properties. Furthermore, we assess the physical relevance of the obtained model graphically by varying the modified model parameter. Our findings indicate that the developed models exhibit consistent stability within the modified framework across every parametric choice. © 2024
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    Minimally deformed anisotropic version of tolman-finch-skea stellar model in enstein-gauss-bonnet gravity
    (Institute of physics, 2025) Azmat, Hina; Khalid, Rafia; Zubair, M.; Demir, Emre; Gudekli, Ertan
    In this article, a well-known anisotropic solution, the Tolman-Finch-Skea (TFS) solution, is studied using the gravitational decoupling approach within the framework of 4D Einstein-Gauss-Bonnet (EGB) gravity. The radial metric potential is modified linearly through the minimal geometric deformation approach, while the temporal component of the metric remains unchanged. The system of EGB field equations is decomposed into two distinct sets of field equations: one corresponding to the standard energy-momentum tensor and the other associated with an external gravitational source. The first system is solved using the aforementioned known solution, while the second is closed by imposing the mimic constraint on pressure. Moreover, the junction conditions at the inner and outer surfaces of the stellar object are examined, considering the Boulware-Deser 4D space-time as the external geometry. The physical properties of the stellar model are analyzed using parameters such as energy conditions, causality conditions, compactness, and redshift.