Recently, the open of a number of observed data, especially the data of SNIa and power spectra of CMB anisotropy and polarization, makes the studies on these two topics become more and more important.

• 目前大量的观测数据的出现，特别是Ia型超新星数据，CMB扰动谱等数据的出现，使得近期对这两个问题的研究更为重要。