Research On Hubble Tension Related Issues In The Accelerated Expansion Of The Late Universe

The state of motion of the universe has always been a concern of the Institute of Cosmology.Astronomical observations on the accelerated expansion of the universe can be divided into two categories.The first category is concerned with the expansion history of the universe,and the second category is concerned with the structural composition of the universe.Both require attention to the Hubble parameter H(z),because the Hubble parameter is the bridge connecting theory and observation.The Hubble parameter represents the evolution rate of the universe,and improving its accuracy can reduce the uncertainty of the age of the universe and reduce the uncertainty of the size of the universe.The focus of this article is on the evolution of the universe and the Hubble tension during the accelerated expansion of the late universe.With the continuous deepening of cosmic research,there has been a significant difference between the area of the cosmic situation and global simulation,which is the Hubble Tension in the study of cosmology.In order to solve the Hubble tension,many researchers have given their own solutions.Although various theoretical models are emerging one after another,where does the Hubble tension come from? How to eliminate Hubble tension?This problem has not been resolved.The research in this article is mainly carried out from the following two aspects: First,on the basis of the existing parameterized model,H(z)is directly parameterized,and the parameterized result is fitted with the existing observation data to try to relieve Hubble tension problem: Secondly,we try to introduce a coupling model of neutrino and early dark energy,by controlling the coupling term to increase the value of Hubble parameters,so as to achieve the effect of alleviating the Hubble tension.