. Wow! I'm impressed! I'm still trying to get thru' Richard Feynman: "Science is the belief in the ignorance of experts."
It's all tensor calculus. Nothing really complicated....once you get it, it's all mechanical, a little like derivation...and in the end, what do you do with all these formulas to apply them to cosmology ?...a poor linearization...
A poor linearization? Perhaps you could explain why ol' Albert decribed his General Theory of Relativity in terms of curved space-time ... or will it cost me to get that explanation?
The field equations of general relativity are a set of nonlinear partial differential equations for the metric. Although I was originally impressed by your (apparent) knowledge of the various topics in this thread ... now I'm convinced otherwise Bye!
Not arguing on my side and I don't think gummy really 'argues'. Just putting things smooth...or linear...