For example, Big Bang Nucleossynthesis says that baryonic content in the Universe is around $0.018 \leq \Omega_{b}h^{2} \leq 0.024$. I know it is something related to measurement error but I do not where it comes from. Someone knows?


$h$ is a dimensionless version of the Hubble parameter $H_0$:

$$H_0=h\times 100\text{ km s}^{-1}\text{ Mpc}^{-1}$$

(See Wikipedia.)

For example, $h=0.7$ means that the Hubble parameter is 70 kilometers per second per megaparsec.

  • $\begingroup$ Fast and precise. Thanks! $\endgroup$ – Jacinto Paulo Nov 18 '19 at 1:01
  • $\begingroup$ The check mark lets you “accept” an answer. $\endgroup$ – G. Smith Nov 18 '19 at 1:03

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