[36grit]

Galaxie after galaxie and the large ratio ,I'm guessing, is filled with stars, dying stars, and or dead stars, that all had to be created over time. I know there are a few young galaxies being discovered, but I presume that the visible universe is no longer a teen ager.
As more and more stars are created in these inumerable galaxies more and more light is fanned out accross the universe. Every ray has to bend around and go through inumerable gravity wells, in flat space, just to get out of it's own galaxie where it travels through and around other galaxies, and other extra terrestial bodies of relativity.
When the universe was young there were fewer stars in the galaxies. The rays flowing around a galaxie could meet the photons that moved through the galaxie mucy easier. Now days the photons that move through the galaxie have more complicated paths to travel.
I guess what I'm basically saying is that, an accelerated expansion is normal in a mature universe due to the fact that there is more and more light that has to travel through a more and more complex field of flat space/time.
I think, or to say, "According to this model in my head", Dark energy and dark matter are binding forces. they force the logical position of entities (or bodies of relativity and mass) into their proper place according to the energy (much of it light) or force that acts upon them.