Dark energy measured with largest ever 3D map of 1.2 million galaxies

A team of hundreds of physicists and astronomers have announced results from the largest-ever, three-dimensional map of distant galaxies, after they have spent five years collecting measurements of 1.2 million galaxies over one quarter of the sky to map out the structure of the Universe over a volume of 650 cubic billion light years.
The team constructed this map to make one of the most precise measurements yet of the dark energy currently driving the accelerated expansion of the Universe.
These new measurements were carried out by the Baryon Oscillation Spectroscopic Survey (BOSS) program of the Sloan Digital Sky Survey-III who has transformed a two-dimensional image of the sky into a three-dimensional map spanning distances of billions of light years, allowing the researchers to make the best measurements yet of the effects of dark energy in the expansion of the Universe.

https://www.sciencedaily.com/releases/2016/07/160714110751.htm

 

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I have a question? According to Special relativity, the velocity of a mass object can cause local space-time to change. Say, hypothetically, all these galaxies, were moving like a unit with the same velocity, would all these galaxies combined, alter the space-time of the volume they share? Say the grouping of galaxies were slowing down, such that group space-time was expanding, would this look like the impact of dark energy?

 

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Not real sure what you are asking, but let me say that every FoR views his own space and time as per normal.
Even the expansion of the universe is only evident over large scales where mass/energy density is less then say the mass/energy density of our own local group of galaxies, which are gravitationaly bound: or to put that another way, the effects of gravity in our local group is overcoming the expansion that is taking place within our local group.
So over ever increasing larger scales, as the universe/spacetime gets less dense, the faster the universe/spacetime expands, due to less overall gravitational effects, and the larger the effects of the DE component whatever that may be.[from our own FoR]
Likewise any being living in another galactic group near say the edge of the observable universe, would look at us and see us as receding at ever faster rates.

 

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