Influence of minimal gravitational decoupling and pseudo isothermal dark matter halo on mass-radius relation and stability of anisotropic compact stars in f(R,T)–gravity
Maurya S.K. Errehymy A. Dayanandan B. Donmez O. Myrzakulov K. Nisar K.S. Mahmoud M.
March 2025Elsevier B.V.
Journal of High Energy Astrophysics
2025#4546 - 61 pp.
We have provided a new exact solution for anisotropic compact stars to the field equations of f(R,T)-gravity via a decoupling technique, with the assumption of a linear f(T) function and the modified Durgapal-Fuloria metric ansatz. By deforming the radial component of the metric and introducing Pseudo-Isothermal (PI) dark matter (DM) as a new source to the anisotropic seed solution in the process of minimally gravitational decoupling, we have obtained a non-singular solution that meets all physical criteria related to effective density, effective pressure, effective anisotropy, and energy conditions. The present system satisfies the modified Tolman-Oppenheimer-Volkoff equation and achieves stable equilibrium, fulfilling stability criteria such as the adiabatic condition, Herrera cracking concept, and Harrison-Zeldovich-Novikov condition. The influence of minimally gravitational decoupling on the characteristics of the system has been illustrated graphically by varying the decoupling constant (γ). The mass-radius relations are linked to observational constraints and examined for anisotropic stellar systems with and without the effect of minimally gravitational decoupling in both general relativity (GR) and f(R,T)-gravity. We found that increasing values of the f(R,T)-gravity parameter (χ) and γ reduce the maximum allowable mass of the star. Therefore, increasing the effects of minimally gravitational decoupling and the PI-DM content, subject to the Durgapal-Fuloria metric potential ansatz, cannot support highly compact and supermassive astrophysical objects.
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Department of Mathematical and Physical Sciences, College of Arts and Sciences, University of Nizwa, Nizwa, 616, Oman
Research Center of Astrophysics and Cosmology, Khazar University, 41 Mehseti Street, Baku, AZ1096, Azerbaijan
Astrophysics Research Centre, School of Mathematics, Statistics and Computer Science, University of KwaZulu-Natal, Private Bag X54001, Durban, 4000, South Africa
Department of General and Theoretical Physics, L.N. Gumilyov Eurasian National University, Astana, 010008, Kazakhstan
Natural and Medical Sciences Research Centre, University of Nizwa, Nizwa, 616, Oman
College of Engineering and Technology, American University of the Middle East, Egaila, 54200, Kuwait
Department of Mathematics, College of Science and Humanities in Alkharj, Prince Sattam bin Abdulaziz University, Al Kharj, Saudi Arabia
Department of Physics, College of Science, King Khalid University, P.O. Box 9004, Abha, 61413, Saudi Arabia
Department of Mathematical and Physical Sciences
Research Center of Astrophysics and Cosmology
Astrophysics Research Centre
Department of General and Theoretical Physics
Natural and Medical Sciences Research Centre
College of Engineering and Technology
Department of Mathematics
Department of Physics
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