- #1

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## Main Question or Discussion Point

Reading about the flatness problem in the standard cosmological model I have came to this relation

[tex]

\frac{1-\Omega(t)}{\Omega(t)}=\frac{1-\Omega_0}{\Omega_0} \frac{1}{1+z}

[/tex]

where

[tex]

\Omega = \frac{\rho}{\rho_c}

[/tex]

and [itex]z[/itex] is the redshift.

I would like to know where this relation cames from. I supose it cames from the Friedmann equations but I am not getting there...

[tex]

\frac{1-\Omega(t)}{\Omega(t)}=\frac{1-\Omega_0}{\Omega_0} \frac{1}{1+z}

[/tex]

where

[tex]

\Omega = \frac{\rho}{\rho_c}

[/tex]

and [itex]z[/itex] is the redshift.

I would like to know where this relation cames from. I supose it cames from the Friedmann equations but I am not getting there...