A new f(Q) cosmological model with H(z) quadratic expansion
Myrzakulov N. Koussour M. Gogoi D.J.
December 2023Elsevier B.V.
Physics of the Dark Universe
2023#42
We present a new f(Q) cosmological model capable of reproducing late-time acceleration, i.e. fQ=λ0λ+Qn by supporting certain parametrization of the Hubble parameter. By using observational data from Hubble, Pantheon, and Baryonic Acoustic Oscillations (BAO) dataset, we investigate the constraints on the proposed quadratic Hubble parameter H(z). This proposal caused the Universe to transition from its decelerated phase to its accelerated phase. Further, the current constrained value of the deceleration parameter from the combined Hubble+Pantheon+BAO dataset is q0=−0.285±0.021, which indicates that the Universe is accelerating. We also analyze the evolution of energy density, pressure, and EoS parameters to infer the Universes accelerating behavior. Finally, we use a stability analysis with linear perturbations to assure the models stability.
Cosmological parameters , f(Q) gravity , Hubble parameter
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L.N. Gumilyov Eurasian National University, Astana, 010008, Kazakhstan
Ratbay Myrzakulov Eurasian International Centre for Theoretical Physics, Astana, 010009, Kazakhstan
Quantum Physics and Magnetism Team, LPMC, Faculty of Science Ben Msik, Casablanca Hassan II University, Morocco
Department of Physics, Dibrugarh University, Assam, Dibrugarh, 786004, India
L.N. Gumilyov Eurasian National University
Ratbay Myrzakulov Eurasian International Centre for Theoretical Physics
Quantum Physics and Magnetism Team
Department of Physics
10 лет помогаем публиковать статьи Международный издатель
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