The Observational Constraints Of The Universe On Dark Matter Models

For humans who are only sensitive to visible light, bright stars and galaxies are significant compositions of the universe, but they are not all of the universe. In the universe, there are a lot of matter we can’t see, that is what we call dark energy and dark matter. Dark energy and dark matter are still very mysterious. In theory, cosmologists put forward various dark matter and dark energy models, as well as reveal its essence through the use of the astronomical observation data.In this dissertation, on the basis of the current observed data of the Universe, several dark matter models are constrained. Specifically, the content of this paper can be broadly divided into four chapters. First of all, in Chapter1, we introduce the research background of the thesis and present a brief review on the research contents and outline of the thesis. Next in Chapter2, we start introducing the basics of cosmology, including the background of cosmology and dark matter models. Then in Chapter3, we introduce the methodology of constraints on dark matter models using the observed data in this thesis, including cosmic microwave background radiation, baryon acoustic oscillation, type-la supernovae and Wig-gleZ. In Chapter4, we present the main background evolution and perturbation equations for dark matter with an arbitrary EoS. Meanwhile the global cosmological parameters are con-strained via the Markov Chain Monte Carlo (MCMC) method. Besides, a tighter constraint was obtained due to the high quality of current cosmic observational data points and the inclusion of WiggleZ measurements of power spectrum. Finally, the summary and outlook are given.