0
$\begingroup$

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?

$\endgroup$
2
$\begingroup$

$h$ 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.

$\endgroup$
  • $\begingroup$ 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

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.