2025/11/01 by I. G. Salako, Ines G. Salako, H. S. Ahouannou +3
Physics and Astronomy · #Astrophysical Phenomena and Observations #Cosmology and Gravitation Theories #Pulsars and Gravitational Waves Research
paper · doi:10.1134/s0040577925110121
crossref issued 2025/11/01 · crossref published 2025/11/01 · crossref published-print 2025/11/01 · openalex publication_date 2025/11/01 · crossref published-online 2025/11/25 · openalex created_date 2025/11/25 · crossref created 2025/11/25 · crossref deposited 2026/04/06 · crossref indexed 2026/07/29 · openalex updated_date 2026/07/30
We explore isotropic charged compact stars within the framework of f(R,\mathcal T\mkern1.5mu) gravity, employing a novel approach grounded in conformal Killing vectors to model strange stars and analyze their physical viability and stability. Utilizing the simplified MIT bag equation of state (EOS) for quark matter, we derive exact solutions to the Einstein field equations for observed masses of strange star candidates, with LMC X- 4 as a representative case. The parameter \varpi (ranging from -1.6 to 1.6 ) governs modifications in the f(R,\mathcal T\mkern1.5mu) gravity formalism, enabling systematic investigation of key properties. Our results confirm singularity-free metric potentials, monotonically decreasing effective energy density ( ρef ) and pressure ( pef ), and adherence to energy conditions across all \varpi values. The mass–radius relationship, analyzed for a fixed bag constant \mathcal B=83 MeV/fm3 , reveals that maximum mass points increase with \varpi . A prescribed density profile (free of central singularities) combined with the MIT bag EOS yields exact solutions to the modified Tolman–Oppenheimer–Volkoff equations, circumventing numerical complexities. Stability analysis demonstrates equilibrium via force balance, with an emergent force F\mathrm m in f(R,\mathcal T\mkern1.5mu) gravity: repulsive (outward) for \varpi<0 and attractive (inward) for \varpi>0 . Stability is further validated by subluminal sound speeds ( v\mathrm s2∈[0,1] ) and adiabatic indices ( Γ>4/3 ). High surface/central densities and redshifts ( ∼ 0.23 – 0.36 ) align with strange quark star characteristics, while all 2M/\mathcal R values remain below the Buchdahl limit. The results establish a robust, stable stellar model for strange stars, leveraging conformal symmetries and f(R,\mathcal T\mkern1.5mu) gravity, and provide a foundation for future studies on alternative density profiles in modified gravity.