A constrained cosmological model in f(R,Lm) gravity
Singh J.K. Shaily Myrzakulov R. Balhara H.
November 2023Elsevier B.V.
New Astronomy
2023#104
In this article, we study the expanding nature of the universe in the context of f(R,Lm) gravity theory, here R represents the Ricci scalar and Lm is the matter Lagrangian density. With a specific form of f(R,Lm), we obtain the field equations for flat FLRW metric. We parametrize the deceleration parameter in terms of the Hubble parameter and from here we find four free parameters, which are constraints and estimated by using H(z), Pantheon, and their joint data sets. Further, we investigate the evolution of the deceleration parameter which depicts a transition from the deceleration to acceleration phases of the universe. The evolutionary behaviour of energy density, pressure, and EoS parameter shows that the present model is an accelerated quintessence dark energy model. To compare our model with the ΛCDM model we use some of the diagnostic techniques. Thus, we find that our model in f(R,Lm) gravity supports the recent standard observational studies and delineates the late-time cosmic acceleration.
Dark energy , f(R, Lm) gravity , FLRW metric , Observational constraints
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Department of Mathematics, Netaji Subhas University of Technology, New Delhi, 110078, India
Ratbay Myrzakulov Eurasian International Centre for Theoretical Physics, Astana, Kazakhstan
Department of Mathematics
Ratbay Myrzakulov Eurasian International Centre for Theoretical Physics
10 лет помогаем публиковать статьи Международный издатель
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