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Originally Posted by joe_smith
So do I, for me it makes more sense, and I like their view of the W-MAP.
Turok and Steinhardt explain it pretty good in the series "Through the worm hole" in episode 4 What Happened Before the Beginning? The big bang was not the beginning of the universe but a collision between branes. Also the fact that "The lack of growth of the most massive galaxies" points to inflation, as explained by the balloon example being not quite right for me. |
I think we need to be careful not to mix things up here.
Under BBT, inflation happened very early on, just after the BB. It was introduced to explain the flatness, homogeneity and isotrophy of the observable universe. It also explains the large scale structures, (super clusters etc). With its incorporation into the Standard Model, it also predicted what has now been measured in the CMBR.
What we have now, is the 'metric expansion of space', which operates roughly at the scale of superclusters. Gravity operates at the smaller galaxy cluster level, causing clumping of normal matter. These clumps do not expand but they do recede from one another. This all has direct observational evidence - Hubble's measurements, redshift, etc.
The expansion we see at present, is partly explained by simple inertia and, partly due to a repulsive force (dark energy). Inertia dominated early on, and the repulsive force will dominate in the future. At present, they contribute in roughly equal amounts.
All of this is based on observed empircal evidence. This forms the basis of constraints on any theory .. no matter which one … even the S-T Model would have to account for these measurements.
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Originally Posted by joe_smith
As if the universe and everything in it is expanding why has some of it supposedly stopped? as they explain in there book science is at exciting point in time as the two models claim the prize, and we are able to see it unfold  |
The expansion at the BCG level would not have been expected anyway, as it is only apparent (from measurements), at the larger scales.
Cheers