Dark energy behavior from static equation of state in non-minimally coupled gravity with scalar deformation
Myrzakulov N. Shekh S.H. Bhoyar S.R. Pradhan A.
March 2026Academic Press Inc.
Annals of Physics
2026#486
In this study, we explore the cosmological implications of a modified gravity theory characterized by the function f(R,Σ,T), where R is the Ricci scalar, Σ represents a geometric deformation term, and T denotes the trace of the energy–momentum tensor. The model is reconstructed under the framework of three fundamental energy conditions: Null Energy Condition (NEC), Dominant Energy Condition (DEC), and Strong Energy Condition (SEC). We derive the corresponding Hubble parameter H(z) for each case and constrain the free parameters H0, α, and β using the latest Cosmic Chronometer (CC) and Pantheon+ Type Ia Supernova datasets. A thorough analysis of physical quantities such as pressure, energy density, and the equation of state parameter is carried out. Furthermore, diagnostic tools including the deceleration parameter q(z), statefinder parameters {r,s}, and the Om(z) diagnostic are employed to assess the models viability. Our findings suggest that the model can consistently describe late-time cosmic acceleration and offers distinct behavior under different energy conditions, all while aligning with current observational data.
Cosmology , Energy conditions , Modified gravity , Observational constraints
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L N Gumilyov Eurasian National University, Astana, 010008, Kazakhstan
Department of Mathematics, S.P.M. Science and Gilani Arts, Commerce College, Ghatanji, Yavatmal, Maharashtra, 445301, India
Pacif Institute of Cosmology and Selfology (PICS), Sagara, Odisha, Sambalpur, 768224, India
Department of Mathematics, Phulsing Naik Mahavidyalaya Pusad, Distt.Yavatmal (M.S), 445216, India
Centre for Cosmology, Astrophysics and Space Science, GLA University, Uttar Pradesh, Mathura, 281 406, India
L N Gumilyov Eurasian National University
Department of Mathematics
Pacif Institute of Cosmology and Selfology (PICS)
Department of Mathematics
Centre for Cosmology
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Книга Публикация научной статьи Волощук 2026 Book Publication of a scientific article 2026