- #1
Radiohannah
- 49
- 0
Hello! :-)
I've been thinking about the RW line element (c^2 d tau^2), and I understand that there is a term which describes the geometry of the Universe (d sigma^2) and then a term corresponding to the cosmic time (c^2 dt^2). The resulting (c^2 d tau^2 ) term would be the line measured by some fundamental observer.
I am confused as to how you may relate this line element to the density of the Universe, as I have read that there is an important relationship between the geometry of the Universe and its density.
I can see how the 'Friedmann equation' may give you a value for density, but I really cannot see the relationship between the Friedmann equation and the RW line element equation? :-S
Any help would be very much appreciated :-)
Thanks
I've been thinking about the RW line element (c^2 d tau^2), and I understand that there is a term which describes the geometry of the Universe (d sigma^2) and then a term corresponding to the cosmic time (c^2 dt^2). The resulting (c^2 d tau^2 ) term would be the line measured by some fundamental observer.
I am confused as to how you may relate this line element to the density of the Universe, as I have read that there is an important relationship between the geometry of the Universe and its density.
I can see how the 'Friedmann equation' may give you a value for density, but I really cannot see the relationship between the Friedmann equation and the RW line element equation? :-S
Any help would be very much appreciated :-)
Thanks