Linear redshift parametrization of deceleration parameter in f(R,Lm) gravity

In this study, we investigate the linear redshift parametrization of q(z) within the framework of f(R,Lm) gravity, using constraints derived from H(z)/Pantheon samples. We consider a non-linear functional form for f(R,Lm), specifically given by f(R,Lm)=R2+Lmn, where n represents a free parameter in...

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Bibliographic Details
Published in:PHYSICS OF THE DARK UNIVERSE 2024-07, Vol.45, p.101545, Article 101545
Main Authors: Myrzakulov, Yerlan, Donmez, O., Yildiz, G. Dilara A., Güdekli, E., Muminov, S., Rayimbaev, J.
Format: Article
Language:English
Subjects:
Dark energy
Deceleration parameter
f(R,Lm) gravity
Observational constraints
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Summary:In this study, we investigate the linear redshift parametrization of q(z) within the framework of f(R,Lm) gravity, using constraints derived from H(z)/Pantheon samples. We consider a non-linear functional form for f(R,Lm), specifically given by f(R,Lm)=R2+Lmn, where n represents a free parameter in the model. Subsequently, we derive the solution for the Hubble parameter by investigating the parametrization of q(z) and then apply this solution to the modified Friedmann equations. Our analysis focuses on exploring the behavior of the EoS parameter across different stages of the universe’s evolution, including radiation, matter, and dark energy eras. Furthermore, our results confirm the quintessence nature of the universe’s current accelerated expansion phase (−1
ISSN:2212-6864
2212-6864
DOI:10.1016/j.dark.2024.101545