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And where is that energy coming from? It can't have all come from the big bang as the expansion is accelerating!
Yeah, but the energy defined is just like with photons. You expand space you get a red shifted photon, that photon will now, according to your measurement, have less energy. So according to you it loses energy by an expansion. And if we assume that one cubic meter 'space' always contain the same energy, then a expansion must state that with more 'space' there will be more 'energy'.
Are you thinking of 'gravity' as a 'negative energy' Wulf?
I'm not sure what you mean by diluted?