Probing the universes expansion dynamics: The linear correction scenario perspective on dark energy
Myrzakulov Y. Koussour M. Karimov M. Rayimbaev J.
June 2024Elsevier B.V.
Journal of High Energy Astrophysics
2024#42209 - 216 pp.
In this study, we investigate the cosmological evolution of the universe, focusing on the KMMS models in a model-independent approach, particularly the scenario involving linear correction, given by E2(z)=A(z)+β(1+γB(z)), where A(z)=Ωm0(1+z)3 and B(z)=z. By analyzing recent Cosmic Chronometers (CC) and the Pantheon+ samples, we determine the best-fit values of model parameters using a Markov chain Monte Carlo analysis. Our models exhibit unique dynamics, transitioning from super-exponential to exponential expansion, with a significant shift at redshift zt=0.83−0.10+0.11 and present deceleration parameter q0=−0.69−0.17+0.17. The jerk parameter exceeds 1, indicating a faster change in acceleration than predicted by ΛCDM. The energy density parameter is consistent with Planck observations, and the dark sector evolution follows the expected thermal history. The EoS parameter approaches ωde=−1 over time, with a current value of ωde0=−1.06±0.12, aligning with the phantom phase. Our model presents a new dark energy alternative, emphasizing the importance of considering models like KMMS in understanding cosmic evolution.
Dark energy , Hubble parameter , KMMS models , Observational constraints
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Department of General & Theoretical Physics, L.N. Gumilyov Eurasian National University, Astana, 010008, Kazakhstan
Ratbay Myrzakulov Eurasian International Center for Theoretical Physics, Astana, 010009, Kazakhstan
Department of Physics, University of Hassan II, Casablanca, Morocco
Institute of Fundamental and Applied Research, National Research University TIIAME, Kori Niyoziy 39, Tashkent, 100000, Uzbekistan
Faculty of Mathematics, Namangan State University, Boburshoh str. 161, Namangan, 160107, Uzbekistan
New Uzbekistan University, Mustaqillik Ave. 54, Tashkent, 100007, Uzbekistan
University of Tashkent for Applied Sciences, Gavhar Str. 1, Tashkent, 100149, Uzbekistan
National University of Uzbekistan, Tashkent, 100174, Uzbekistan
Department of General & Theoretical Physics
Ratbay Myrzakulov Eurasian International Center for Theoretical Physics
Department of Physics
Institute of Fundamental and Applied Research
Faculty of Mathematics
New Uzbekistan University
University of Tashkent for Applied Sciences
National University of Uzbekistan
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