Some Studies On The Interacting Model Of New Agegraphic Dark Energy

Since the discovery of the accelerating expansion of the Universe through observa-tions of distant supernovae in 1998, the research on the physical nature of dark energy becomes one of the most important and valuable. Together with dark matter, which is found in the 1960s, the dark sectors are fashionable topics. With the developing of science and technology, the improving of observation accuracy and also the cumulating of observation data, we human have enter the epoch of accurate measurement. In the introduction of this thesis, the history of cosmology is introduced in the order of time, especially the reaches after the discovery of dark energy. In the second chapter, some basic knowledge of cosmology is present. Several models for the accelerated universe are introduced, mainly including the model of cosmological constant, the interacting dark energy model, and the new agegraphic dark enery model. In chapter three, I introduce several observation (namely the type Ⅰa supernovae, the baryon acoustic oscillation from the Sloan Digital Sky Survey, the cosmic microwave background and the observation of hubble constant), and how to use these data in fitting the model. In the fourth chapter, I introduced several holographic dark energy models. I force on the study of interacting new agegraphic dark energy models. Fitting this model with newest data, the results show that even we add another free parameter, but the interaction improve the new agegraphic dark energy model. The other goal of this paper is to show how the different CMB data, WMAP9 and Planck, effect on the final result. The result shows that the latest Planck data support the interacting dark energy model. Also, I do some comparison between this work and several important researches. The result shows that this thesis has some unique advantage in data selecting, data processing and model specification.