Late time attractors of some varying chaplygin gas cosmological models
Khurshudyan M. Myrzakulov R.
May 2021MDPI AG
Symmetry
2021#13Issue 5
The goal of this paper is to study new cosmological models where the dark energy is a varying Chaplygin gas. This specific dark energy model with non-linear EoS had been often discussed in modern cosmology. Contrary to previous studies, we consider new forms of nonlinear non-gravitational interaction between dark matter and assumed dark energy models. We applied the phase space analysis allowing understanding the late time behavior of the models. It allows demonstrating that considered non-gravitational interactions can solve the cosmological coincidence problem. On the other hand, we applied Bayesian Machine Learning technique to learn the constraints on the free parameters. In this way, we gained a better understanding of the models providing a hint which of them can be ruled out. Moreover, the learning based on the simulated expansion rate data shows that the models cannot solve the H0 tension problem.
Accelerated expansion , Bayesian machine learning , Dynamical dark energy models
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Institute of Physics, University of Silesia, Katowice, 40-007, Poland
Consejo Superior de Investigaciones Científicas, ICE/CSIC-IEEC, Campus UAB, Carrer de Can Magrans s/n, Bellaterra, Barcelona, 08193, Spain
International Laboratory for Theoretical Cosmology, Tomsk State University of Control Systems and Radioelectronics (TUSUR), Tomsk, 634050, Russian Federation
Eurasian National University, Nur-Sultan, 010008, Kazakhstan
Ratbay Myrzakulov Eurasian International Centre for Theoretical Physics, Nur-Sultan, 010009, Kazakhstan
Institute of Physics
Consejo Superior de Investigaciones Científicas
International Laboratory for Theoretical Cosmology
Eurasian National University
Ratbay Myrzakulov Eurasian International Centre for Theoretical Physics
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