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marcus said:
That's a pretty nice implementation of the standard cosmology model! You could say that it is better than both of the ones I've been using because it combines good features of the Morgan one and the Wright one.

Thanks Marcus. My motivation has been to include a variable for Omega_radiation, which none of the then cosmo-calculators had. Hellfire offered me his source code and the freedom to modify it, so I've added Omega_r and a few outputs.

For the usual ranges of z < 100 or so, Omega_r makes virtually no difference, but it becomes noticeable around z > 1000, where Omega_r_then makes up around 25% of Omega. It is primarily of interest for looking at the sensitivity of the standard model to radiation density. It's also nice to verify or demonstrate radiation dominance at z > ~3300.
 
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Hey thanks for your help guys! It's been really fascinating to find out that there are special metrics for cosmological objects. This has really given me a greater appreciation for abstact algebras and geometries. I really feel like I have a better understanding of cosmology now.

Thank you SO MUCH!