Exploring B(z)CDM models beyond ΛCDM: Observational data and cosmographic analysis
Errehymy A. Koussour M. Donmez O. Myrzakulov K. Nisar K.S. Abdel-Aty A.-H.
December 2024Elsevier B.V.
Physics of the Dark Universe
2024#46
With its model-independent approach, cosmography has emerged as an invaluable tool for faithfully representing a wealth of astrophysical observations, free from theoretical biases. This study employs cosmography to investigate two innovative cosmological models, B(z)CDM models 1 and 2, which introduce novel corrections to the standard ΛCDM model, B(z)=sin(z) and B(z)=log(1+z), respectively. By analyzing a variety of observational datasets, including 31 measurements from cosmic chronometers (CC), 1048 data points from the Pantheon dataset, 6 measurements from baryon acoustic oscillations (BAO), and data from cosmic microwave background (CMB) measurements, we derive constraints on model parameters and assess their compatibility with real-world observations. We find that the present values of the deceleration parameter for B(z)CDM models 1 and 2 are q0=−0.54−0.23+0.24 and q0=−0.56−0.40+0.45, respectively, for the combined datasets. The results reveal intriguing transitions in the expansion of the universe, confirming the presence of DE and quintessence-like behavior within the framework of B(z)CDM models.
B(z)CDM , Cosmography , Model-independent approach , Observational constraints
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Astrophysics Research Centre, School of Mathematics, Statistics and Computer Science, University of KwaZulu-Natal, Private Bag X54001, Durban, 4000, South Africa
Department of Physics, University of Hassan II Casablanca, Morocco
College of Engineering and Technology, American University of the Middle East, Egaila, 54200, Kuwait
Department of General and Theoretical Physics, L.N. Gumilyov Eurasian National University, Astana, 010008, Kazakhstan
Department of Mathematics, College of Science and Humanities in Alkharj, Prince Sattam bin Abdulaziz University, Al Kharj, Saudi Arabia
Department of Physics, College of Sciences, University of Bisha, P.O. Box 344, Bisha, 61922, Saudi Arabia
Astrophysics Research Centre
Department of Physics
College of Engineering and Technology
Department of General and Theoretical Physics
Department of Mathematics
Department of Physics
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