Yazar "Taṣer, Dog̃ukan" seçeneğine göre listele

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    Compact stars in ?(R, T) gravity
    (Springer Science and Business Media B.V., 2023) Taṣer, Dog̃ukan; Dog̃ru, Sertaç Serkan
    The study is conducted for investigation of a new solution for stellar objects in κ(R, T) theory. We investigate whether Krori–Barua model produces valid results in κ(R, T) theory. We attain field equations through Krori–Barua metric form related with geometry of inner space. From field equations, we obtain all unknown matter components κ(T) = 8 πG− λT in the theory. Constructed model is considered with some class of compact stars such as 4 U1820 − 30 , SAXJ1808.4 − 3658 , and HerX− 1 . To prove physical stability of the constructed model, we investigate both normal and effective matter form behaviors by way of some physical conditions. It is found that all conditions are valid for effective matter. Therefore, this study reveals consistency of both the compact star model and the gravitation theory. But a remarkable point is that normal matter has to face some problems in the κ(R, T) theory.
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    Einstein-Rosen universe with scalar field in f(R,T) theories
    (Elsevier B.V., 2021) Taṣer, Dog̃ukan; Dog̃ru, Melis Ulu
    Non-static Einstein–Rosen universe with scalar field is examined via two different selection of f(R,T) models. Firstly, we analyzed Einstein–Rosen universe with scalar field in f(R,T)=R+2f(T) model. Then, we constructed field equations for f(R,T)=f1(R)+f2(R)f3(T) model, as well. For both models, exact solutions of field equations have been attained without considering any approximation or restriction. Whether scalar field corresponds to phantom and/or quintessence scalar field are investigated for each models.