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Chalnoth
#44
Sep12-10, 04:34 PM
Sci Advisor
P: 4,836
Quote Quote by JDoolin View Post
On your other detail, you are asking "Can the Milne model predict the lumpiness." Of course not! We can see it, and perhaps hope to find an explanation for it, but the idea that you could or should predict the lumpiness of the CMBR from a metric is mere conceit. It is analogous to asking a man to "predict" the shape of the mountains and valleys on an unseen planet, using only the Pythagorean theorem.
Then why should we pay it any attention? We have a perfect explanation for the lumpiness we do see, an explanation that is not only very specific and detailed, but also accords with other observations. And that explanation precludes the possibility of a Milne cosmology. Unless you can present a model that has at least as much predictive power as the current cosmology, nobody is going to care.

Quote Quote by JDoolin View Post
If you have a map, you can develop a real theory: With WMAP and COBE, for instance, they could see that the light was a thermal spectrum, and then they were able to come up with a phenomenon that caused it. Other than using the idea of redshift, the standard model neither helped nor hindered them in figuring out that the process must be caused by recombination.
This isn't in any way the case. The big bang theory predicted the thermal spectrum. This was expected back when the CMB was first predicted.

And as for the lumpiness, at the time COBE was launched, there were two major competing theories that predicted its statistical properties: cosmic strings, and inflation. Inflation won out. This was apparent with COBE plus balloon data, but became blatantly and wildly obvious with WMAP.