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Posts Tagged ‘baryon oscillation’

BOSS Quasars Unveil a New Era in the Expansion History of the Universe

November 12, 2012

By collecting tens of thousands of quasar spectra, the Baryon Oscillation Spectroscopic Survey (BOSS) has measured the large-scale structure of the early universe for the first time. Like backlights in the fog, the quasars illuminate clouds of hydrogen gas along the line of sight. No other technique can reach back over 10 billion years to probe structure at a time when the expansion of the universe was still decelerating and dark energy was yet to turn on.

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The Evolving Search for the Nature of Dark Energy

October 27, 2009

Baryon acoustic oscillations provides a “standard ruler” for the Universe, a way to measure the details of dark energy.

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