Equation 12 · Part 1 · From Origins to Frontier: A History of Precision Cosmology
Symbol H_0
What this part means
the reported a local.
Its job in the formula
is a part of this expression. Its role is fixed by the surrounding article and by the operations shown in the formula.
Full expression→Symbol H_0→Article meaning
Where the article explains it
The SH0ES team’s 2022 analysis, using Hubble Space Telescope observations of Cepheids in the hosts of forty-two Type Ia supernovae, reported a local of 73.04 ± 1.04 kilometers per second per megaparsec [ 7 ] .
The passage around this formula
…one using the tip of the red-giant branch, with only partial convergence. On the early-universe side, the acoustic scale itself is not in question, but the assumed pre-recombination physics used to convert it into could in principle be incomplete — an early form of dark energy, extra relativistic species, or modified matter behavior before recombination could each shift the inferred and thus without Planck’s raw measurement being wrong. No single proposed fix currently resolves the tension…
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Sources cited in the article section
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