ΛCDM

Lambda Cold Dark Matter Concordance Model

In recent years there has been an intensive study of the expanding universe and Hubble's Law. Many experiments and lines of modeling have contributed to the evaluation of the universe's expansion. After the earlier COBE and WMAP satellite data, the Planck satellite collected data for 4.5 years and as of 2020 provides the most accurate evaluation of the CMB radiation. The graphical history of Hubble's Law evaluation shown below is from the NASA publication on the Hubble Constant, H₀.

Image Credit NASA 图片版权 NASA

This plot compares values for H0 derived from a variety of methods. It includes 2016 and 2019 values from the distance ladder which builds from successive methods. It also includes a value from the observation of gravity waves, which is independent of that distance ladder. 这张图比较了通过多种方法得出的H₀值。它包括了2016年和2019年通过距离阶梯方法得出的值，该方法基于连续的多种方法。它还包含了一个来自引力波观测的值，该值独立于距离阶梯方法。

Image Credit NASA 图片版权 NASA

This plot compares values for H0 derived from the CMB only. 这张图比较了仅从CMB得出的H₀值。

After the extensive data from the Planck satellite was received, the 2015 reports from the Planck Collaboration presented descriptive parameters for the universe in the ΛCDM concordance model:

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