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Finding the best interacting dark energy model with observed data
Kim JeongCho,Lee Hyung Won,Kim Kyoung Yee 한국물리학회 2022 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.81 No.2
Dark energy and dark matter problem is one of the most important issues in modern cosmology. There are many candidate models explaining the current observed dark matter and dark energy density parameters. One of the promising models is the interacting dark energy model with holographic principle applied. It was shown that interacting holographic dark energy model in non-fat universe cannot accommodate a transition from the dark energy to the phantom regime and its background cosmological evolution is compatible to current observational data of energy fractions between dark matter and dark energy. However, only a few selected parameters yielded compatible cosmological background evolution. In this article, we want to extend this model to incorporate the current observed Hubble data as red shift. It was shown that the physical parameter most compatible to observed data are H0 ∼ 68 and interaction parameter b2 ∼ 0.009. We have applied a simple numerical regression technique to fnd out the best interacting model parameters to ft the current observational data. We have shown that the background cosmological evolution is insensitive to interaction strength but the evolution of Hubble constant.