Quote:
|
Originally Posted by Bob Angstrom
Quote:
|
Originally Posted by Thanatos
The CMB was hotter in the past. This is very difficult to explain without an expanding universe model:
Molecular Hydrogen in a Damped Lyman-alpha System at z_abs=4.224
http://www.arxiv.org/abs/astro-ph/0602212 |
We have a static observation of 2.73 K for the CMB. How do we know that it was once hotter? Has anyone observed a temperature change?
We know the CMB was once hotter because the universe is expanding and we know the universe is expanding because the CMB was once hotter but is there any evidence for change outside this circular loop? |
There are a number of observations which have been interpreted as "the CMB was hotter in the past, in line with one or other BBT".
Any alternative cosmology should address these. However, as they are marginal, I imagine that would not be difficult.
Quote:
|
Originally Posted by P.Asmah
Why were there so many more accurate predictions in relation to the CMB temperature before BB supporters stole it as their own?
|
If you know of an alternative cosmology which can account for the (observations of the) CMB (and the other four points), by all means please present it here (along with details of how well it matches the underlying observations).
Note that the CMB observations are considerably more extensive than just a temperature - they include its SED (spectral energy distribution), a near-perfect blackbody - for example, and a dipole.
To repeat the intent of this thread, as stated in the OP:
Quote:
I am stressing observations, not interpretations. For example, in an alternative cosmology, the CMB may not have a distant origin, or the observed redshifts for galaxies, in the Hubble relationship, may arise from quite different mechanisms.
Once again, this thread is NOT about how well, or how poorly, any BB theory does, or does not, match the five sets of observations. This thread is about which alternative cosmological theory fits these observations best.
|