Constraining the cosmological model of modified f(Q) gravity: Phantom dark energy and observational insights
Koussour M. Myrzakulov N. Alfedeel A.H.A. Abebe A.
1 November 2023Physical Society of Japan
Progress of Theoretical and Experimental Physics
2023#2023Issue 11
Despite the significant accomplishments of general relativity, numerous unresolved issues persist in our understanding of the cosmos. One of the most perplexing challenges is the ongoing accelerated expansion of the Universe, which continues to elude a complete explanation. Consequently, scientists have proposed various alternative theories to general relativity in pursuit of a deeper understanding. In our analysis, we delve into the recently proposed modified f(Q) gravity, where Q represents the nonmetricity scalar responsible for gravitational effects. Specifically, we investigate a cosmological model characterized by the functional form f(Q) = Q + αQn, where α (with α = 0) and n serve as free parameters. Utilizing this functional form, we construct our Hubble rate, incorporating a specific equation of state to describe the cosmic fluid. Furthermore, we leverage a dataset consisting of 31 data points from Hubble measurements and an additional 1048 data points from the Pantheon dataset. These data serve as crucial constraints for our model parameters, and we employ the Markov Chain Monte Carlo (MCMC) method to explore the parameter space and derive meaningful results. With our parameter values constrained, our analysis yields several noteworthy findings. The deceleration parameter suggests a recent accelerated phase in the cosmic expansion. In addition, the EoS parameter paints a portrait of dark energy exhibiting phantom-like characteristics. Furthermore, we delve into the application of cosmological diagnostic tools, specifically the statefinder and the Om(z) diagnostics. Both of these tools align with our previous conclusions, confirming the phantom-like behavior exhibited by our cosmological model. These results collectively contribute to our understanding of the dynamic interplay between gravity, dark energy, and the expanding cosmos.
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Quantum Physics and Magnetism Team, Laboratory of Physics of Condensed Matter (LPMC), Faculty of Science Ben M’sik, Casablanca Hassan II University, Morocco
Department of General and Theoretical Physics, L. N. Gumilyov Eurasian National University, Astana, 010008, Kazakhstan
Ratbay Myrzakulov Eurasian International Centre for Theoretical Physics, Astana, 010009, Kazakhstan
Department of Mathematics and Statistics, Imam Mohammad Ibn Saud Islamic University (IMSIU), Riyadh, 13318, Saudi Arabia
Department of Physics, Faculty of Science, University of Khartoum, P.O. Box 321, Khartoum, 11115, Sudan
Centre for Space Research, North-West University, Potchefstroom, 2520, South Africa
National Institute for Theoretical and Computational Sciences (NITheCS), Stellenbosch, 3201, South Africa
Quantum Physics and Magnetism Team
Department of General and Theoretical Physics
Ratbay Myrzakulov Eurasian International Centre for Theoretical Physics
Department of Mathematics and Statistics
Department of Physics
Centre for Space Research
National Institute for Theoretical and Computational Sciences (NITheCS)
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