Summary: The BOSS (Baryon Oscillation Spectroscopic Survey) collaboration has released a new report with record precision of 1% and a more accurate measure of w, Dark Energy's pressure to density ratio. If this number is simply Einstein's cosmological constant, then w=-1. The new data seems to provide solid proof for this theory as their results yielded w= -1.03±0.06.
The overall purpose of the collaboration is to more precisely determine the redshift of galaxies so that astronomers can connect this measurement with other measurements of cosmological distance. This correlation can then be applied to galaxies that are too far to measure distance by anything other than redshift.
Physics Today
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