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This is what Schroeder is doing. He sends out an imaginary signal (say each second) and during this time, the universe is expanding, so the signal has further to travel.
This looks squirrelly ( hmmm... ispell says that is spelled correctly. ) to me. What you are actually talking about is 6½ days equalling 15 billion minus 6000 years, yes? In other words, this expansion stopped a few thousand years ago.
Ok. Problems:
1) This rapid expansion stopped a few thousand years ago-- our perspective. There is no mechanism other than divine intervention. Why did it stop, and what drove the expansion to start with?
2) The 6½ days is God's time, yes? For us this looks like 15 billion years? Well, you have...
Genesis: 11 And God said, Let the earth bring forth grass, the herb yielding seed, and the fruit tree yielding fruit after his kind, whose seed is in itself, upon the earth: and it was so.
12 And the earth brought forth grass, and herb yielding seed after his kind, and the tree yielding fruit, whose seed was in itself, after his kind: and God saw that it was good.
... on the third day. Relatively speaking, this would put complex life on Earth a couple of billion years before the Earth formed. The third day God's time would be about six or seven billion years ago from our perspective; and from our perspective the Earth is only about five billion years old. Life didn't pop up for another couple of billion, and complex plant life didn't arrive until 500 million years ago or so.
3) Expansion at this rate would overtake gravity. Things like stars and planets wouldn't form-- the molecules would be pulled apart faster than they could coalesce.
4) As I understand it, expansion doesn't alter the speed of light, it stretches the wavelength. We couldn't miss that effect. It would not look like a slow expansion.
That's my off-the-top-of-my head list.
I'm sure others have better things to contribute.
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