Blog post: The Universe Before Dark Energy
Apr 5, 2017
The expansion history of the Universe is shown as a function of look back time. The black line is a prediction based on fitting cosmic microwave background data from the Planck satellite. It shows the Universe decelerating until roughly 6 billion years ago, when dark energy became the dominant energy component of the Universe and caused an accelerated expansion. The green data point shows a measurement of the current expansion, while the red data points show measurements using the BAO standard ruler in the clustering of BOSS galaxies. The blue data point shows the new BAO measurement using the Lyman alpha forest.]