- #1
ibysaiyan
- 442
- 0
Greetings everyone ,
Can anyone point me into the right direction on how to come out with a value/ expression for the density parameter of a radiation dominated universe.
Things that I know of/ can recall are:
Friedmann equation :
[tex] 8/3 \pi G ρ R^2 -kc^2 [/tex]
Also when radiation dominates matter then we get ρ = 1/R^4 ( I think)
Density parameter :
So what am I missing to give me the density parameter ? [itex]\Omega_{m}[/itex] = [itex]\rho / \rho_{critical}[/itex]
where
[itex]\rho_{critical}= (3H^2 q / 4Pi G) [/itex]
Any sort of help is appreciated.
-ibysaiyan
Can anyone point me into the right direction on how to come out with a value/ expression for the density parameter of a radiation dominated universe.
Things that I know of/ can recall are:
Friedmann equation :
[tex] 8/3 \pi G ρ R^2 -kc^2 [/tex]
Also when radiation dominates matter then we get ρ = 1/R^4 ( I think)
Density parameter :
So what am I missing to give me the density parameter ? [itex]\Omega_{m}[/itex] = [itex]\rho / \rho_{critical}[/itex]
where
[itex]\rho_{critical}= (3H^2 q / 4Pi G) [/itex]
Any sort of help is appreciated.
-ibysaiyan
Last edited by a moderator: