利用改进了的宇宙模型独立法重建宇宙膨胀史

Reconstructing the cosmic expansion history with a improved cosmological model-independent method

首先利用距离对偶关系重新修正了Union2.1超新星数据光曲参数;然后用该光曲参数重新计算了Ia型超新星的距离模量;最后用模型独立法重建了宇宙膨胀史和暗能量的演化性质.在1σ置信度,重建的宇宙的膨胀史及暗能量性质与真空暗能量模型并不一致,这一结果更支持一个随红移演化的暗能量宇宙模型.

With the help of the distance-duality relation （DDR）, the light-curve fitting parameters, which in the distance estimation from the original Union2.1 SNe Ia compilation, were calibrated, the distance modulus for the SNe Ia with the corrected fitting parameters were re-estimated, and using the cosmological-model- independent reconstruction, for the cosmic expansion history and the evolving property of dark energy were reconstructed. The result shows that the reconstructed results are inconsistent with the ACDM model at 1σ confidence level （CL）, and it seem to support an evolutionary dark energy with redshift evolution.