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Bardeen stellar objects in f(ℛ,) modified gravity.

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Title: Bardeen stellar objects in f(ℛ,) modified gravity.
Authors: Malik, Adnan1,2 (AUTHOR) adnan.malik@skt.umt.edu.pk, Almas, Ayesha2 (AUTHOR) ayesha787@icloud.com, Mofarreh, Fatemah3 (AUTHOR) fyalmofarrah@pnu.edu.sa, Shafaq, Attiya2 (AUTHOR) attiyashafaq10@gmail.com, Farasat Shamir, M.4,5 (AUTHOR) f.shamir@qmul.ac.uk
Source: International Journal of Geometric Methods in Modern Physics. Jun2026, Vol. 23 Issue 7, p1-23. 23p.
Subjects: Compact objects (Astronomy), Stellar structure, Stability theory
Abstract: This study presents a comprehensive analysis of stellar configurations within the framework of f (ℛ ,) gravity, where ℛ represents the Ricci scalar denotes the anti-curvature scalar. This model aims to accurately describe compact stars, bridging general relativity with the modified f (ℛ ,) gravity. The research focuses on charged anisotropic matter distributions in static, spherically symmetric spacetimes and employs the Krori–Barua metric to relate the radial ( g r r ) and transverse ( g t t ) components of the line element. Parameter values are derived using Bardeen's star as the external geometry and observational data from 10 well-known compact stars, including PSR 1937 + 21, PSR J1614-2230, 4U 1608-52, Vela  X − 1 , PSR 1903 + 327, LMXC–4, Cen X–3, 4 U 1 8 2 0 − 3 0 , SMX J 1 8 0 8 − 3 6 5 8 and Her  X − 1. The study evaluates various physical properties, such as pressure distribution, equilibrium and stability conditions, energy density, energy conditions, mass function trends and adiabatic parameters, to validate the f (ℛ ,) model's applicability. The findings conclude that the f (ℛ ,) gravity model successfully supports the existence of compact stars with remarkable physical characteristics. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:This study presents a comprehensive analysis of stellar configurations within the framework of f (ℛ ,) gravity, where ℛ represents the Ricci scalar denotes the anti-curvature scalar. This model aims to accurately describe compact stars, bridging general relativity with the modified f (ℛ ,) gravity. The research focuses on charged anisotropic matter distributions in static, spherically symmetric spacetimes and employs the Krori–Barua metric to relate the radial ( g r r ) and transverse ( g t t ) components of the line element. Parameter values are derived using Bardeen's star as the external geometry and observational data from 10 well-known compact stars, including PSR 1937 + 21, PSR J1614-2230, 4U 1608-52, Vela  X − 1 , PSR 1903 + 327, LMXC–4, Cen X–3, 4 U 1 8 2 0 − 3 0 , SMX J 1 8 0 8 − 3 6 5 8 and Her  X − 1. The study evaluates various physical properties, such as pressure distribution, equilibrium and stability conditions, energy density, energy conditions, mass function trends and adiabatic parameters, to validate the f (ℛ ,) model's applicability. The findings conclude that the f (ℛ ,) gravity model successfully supports the existence of compact stars with remarkable physical characteristics. [ABSTRACT FROM AUTHOR]
ISSN:02198878
DOI:10.1142/S0219887825502068