Yazar "Kirezli, Pinar" seçeneğine göre listele

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    Analyzes of algebraic classification of higher dimensional Kundt geometries with large D method
    (Tubitak Scientific & Technological Research Council Turkey, 2023) Kirezli, Pinar
    In this paper, the classification of higher dimensional Kundt geometry is revisited as the dimension of the spacetime D -> infinity. In addition to previous studies, in order to Kundt geometry becomes algebraically special spacetime obligatory conditions are determined. Additionally, Type II, Type III, Type N, Type O, and Type D Kundt geometries are explicitly analyzed. Classification of several metrics such as pp-waves, nongyratonic Kundt metric, and VSI spacetime, which are well-known subclasses of Kundt geometry are studied.
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    Compact objects in f(R,Lm) theory
    (World Scientific Publ Co Pte Ltd, 2025) Taser, Dogukan; Dogru, Melis Ulu; Kirezli, Pinar; Aydn, Huseyin; Eraslan, Erkan
    In this study, it is aimed to investigate the Krori-Barua type compact stars within the scope of f(R, L-m) theory. In this context, first, the field equations are obtained by considering the f(R, L-m) = R/2 + alpha L-m(n) model. Interestingly, the model offers chance to attain all components of matter without any restrictions. In addition, data sets from LMC X-4, EXO 1785-248 and Cen X-3 are used to analyze physical stability of the solutions. It is obtained that all conditions such as causality and stability. which indicate consistency between compact objects and f(R, L-m) theory are valid for the constructed model. We obtained that small values of n in the f(R, L-m) function show significant effect on the consistency of the star models. Therefore, different n values are considered for each star data set when graphing the physical states. Finally, necessary quantities of the model are defined, compared with the considered stars and discussed in detail.
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    Static, cylindrically symmetric spacetime in the coincident f(Q) gravity
    (Iop Publishing Ltd, 2024) Kirezli, Pinar; Ozceylan, Nilhan
    In this paper we consider a static, cylindrically symmetric spacetime with coincident f(Q) gravity. Since the field equation of this spacetime in symmetric teleparallel gravity is suitable for choosing the function of f(Q) in the form of power series and exponential forms which are in coherent with cosmological observations, anisotropic perfect fluid solutions of these forms are discussed for this spacetime. Energy densities, directional pressures and energy conditions are plotted and analysed for a few different metric potentials. Although corresponding cosmic strings violate all energy conditions in both f(Q) functions, the corresponding Levi-Civita solution violates all energy conditions in the power law function of f(Q), but for exponential f(Q) gravity they are satisfied in small regions.