Yazar "Aydin, Huseyin" seçeneğine göre listele

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    Öğe
    Conformal wormholes in f(R,Lm) theory
    (Iop Publishing Ltd, 2024) Taser, Dogukan; Dogru, Melis Ulu; Eraslan, Erkan; Aydin, Huseyin
    In this study, we present a new static and conformally symmetric wormhole solution. We develop new wormhole model in f(R,L-m) gravity. Shape function of conformally symmetric f(R,L-m) wormholes, provided by homothetic vector field is obtained regarding to conformal factor. It is investigated whether the function provides a stable throat infrastructure that does not allow collapsing. Anisotropic fluid matter filled the obtained conformally symmetric traversable wormholes is discussed by examining the dynamical properties of the fluid. Constructed new wormhole model violates all energy conditions. Physical significance of the sources filled constructed wormholes is discussed using volume quantifier. It is revealed that f(R,L-m) theory allows traversable and conformally symmetric wormholes if supported by phantom field.
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    Cylindrically Symmetric Domain Wall In Unimodular f(R) Gravity
    (Amer Inst Physics, 2019) Aydin, Huseyin; Dogru, Melis Ulu
    In this study, we examine cylindrically symmetric domain wall distributions in the context of unimodular f(R) gravity. We use unimodular and static cylindrically symmetric spacetime. Field equations and their solutions for the spacetime and the matter are considered. It is shown that unimodular f(R) gravity allows to static cylindrically symmetric spacetime geometry independent from domain wall tension. Other properties of the model are also discussed.
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    Öğe
    Kantowski-Sachs model in non-minimally coupled scalar theory
    (World Scientific Publ Co Pte Ltd, 2022) Taser, Dogukan; Dogru, Melis Ulu; Aydin, Huseyin
    In this study, our main purpose is to study a model which is homogenous and anisotropic describing early stage of Universe in non-minimally coupled scalar theory. It is quite interesting to study a model describing early stage in modified theory which is related to scalar field. In this context, we introduced Kantowski-Sachs metric for perfect fluid in non-minimally coupled scalar theory. Exact solution of field equations is attained for f(R,phi) = (1 + xi eta(2)phi(2))R model. Matter distributions for radiation, cosmic string and cosmological constant are investigated for constructed model. For different selections of arbitrary constants, Kantowski-Sachs model shows three different behaviors related with Hubble parameter and deceleration parameter. Also, some observational parameters, such as luminosity distance, angular diameter distance and distance modulus, are obtained for Kantowski-Sachs Universe. Lastly, we get Statefinder parameters for the model. All properties of constructed model are discussed from a physical and geometric point of view.
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    Öğe
    Unimodular f(G, T) gravity
    (World Scientific Publ Co Pte Ltd, 2023) Dogru, Melis Ulu; Aydin, Huseyin; Taser, Dogukan
    In this study, unimodular f(G,T) gravity is proposed as an alternative theory of gravity. Field equations of unimodular f(G,T) gravity are suggested. The field equation and their solutions are obtained for exponential expansion and power-law expansion models. Energy conditions of unimodular f(G,T) gravity are defined by using Raychaudhuri equations. Energy conditions for exponential expansion and power-law expansion models are investigated. Hubble parameter and deceleration parameter are calculated by considering power-law expansion model and obtained solutions. It has been shown that both deceleration parameter and Hubble parameter are compatible with the current observational data.