- #1
yuiop
- 3,962
- 20
Can someone provide an equation that would enable me to plot the red "pear shaped" line shown in this diagram? http://www.astro.ucla.edu/~wright/omega0.gif
The red line represents the path of a photon as the universe expands in comoving coordinates. Can the path be derived from the Friedmann-Robertson-Walker (FWR) metric? I do not really need the derivation. Just a simple equation that I can plot on a graph, like the parametric equation for a circle, x^2+t^2=1
Thanks :)
The red line represents the path of a photon as the universe expands in comoving coordinates. Can the path be derived from the Friedmann-Robertson-Walker (FWR) metric? I do not really need the derivation. Just a simple equation that I can plot on a graph, like the parametric equation for a circle, x^2+t^2=1
Thanks :)