Symbol H_0
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A third, independent method has entered the field in the past two decades: baryon acoustic oscillations imprinted not on the CMB but on the later, three-dimensional distribution of galaxies themselves. The same sound waves that set the CMB’s acoustic scale also left a faint, statistically detectable preferred separation between galaxies — a standard ruler that can be measured at many different cosmic epochs by surveying galaxy positions and redshifts in bulk. The Dark Energy Spectroscopic Instrument, operating at Kitt Peak with roughly five thousand robotically positioned optical fibers that can each be aimed at a separate pre-selected galaxy or quasar every exposure, released its first-year…
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Equation 16 · Astronomy & Cosmology
From Origins to Frontier: A History of Precision Cosmology
This equation states an equality: the expressions on both sides have the same value under the article’s assumptions.
A third, independent method has entered the field in the past two decades: baryon acoustic oscillations imprinted not on the CMB but on the later, three-dimensional distribution of galaxies themselves. The same sound waves that set the CMB’s acoustic scale also left a faint, statistically detectable preferred separation between galaxies — a standard ruler that can be measured at many different cosmic epochs by surveying galaxy positions and redshifts in bulk. The Dark Energy Spectroscopic Instrument, operating at Kitt Peak with roughly five thousand robotically positioned optical fibers that can each be aimed at a separate pre-selected galaxy or quasar every exposure, released its first-year…
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