posted on Jan, 9 2014 @ 02:53 PM
Im no expert in this area either, though do have some astronomy background. I think it is all about multiple checks and measurements.
Pretty nice explanation here
The oscillation stems from the formation of areas of increased density during the early universe. These would have been regions of early star
formation and early galaxy formation. You expect these early density regions take on an almost acoustic propagation of shockfronts due to the high
density of matter in the early universe.
As the universe cools and expands these density ripples form the seeds of early galaxy formation, which continues to propagate as the universe
expands. It is then the idea that if you know the redshift of the objects you can measure their distances also and then do a 3D search into deeper and
deeper fields. The acoustic rings are thought to be a standard length of 490M light years in todays universe. It is the idea that if the universe
started out as a hot soup, as it cooled you would expect that all regions of space are somehow connected, at least at the time the CMB was formed. So
you would expect distribitions of galaxies and clusters to be related but also isotropic. Seeding for these galaxies would have been from the same
time the CMB froze out. So it allows you to identify objects that are acoustically linked (at the time the CMB froze out)
If you look at a field of galaxies and clusters, you can use other methods at your disposal to figure out the radial distance to an object, the
location on the plane gives you spacial distance and if you can attribute locations to be caused by an acoustic shockfront, then you can say that
depending on the distance of the objects, they should have a standard distance between them, because the universe has been expanding for x amount of
Im not sure if that makes sense, I do understand it but lack the expertise to fully explain it. id have to think about it a bit more.
to me it seems like ink propagating on the surface of water. If you know drop ink on water it should expand in a circle, if you did the same
experiment at differnt distances from you, the observer, you expect to see different sized rings, but you know that they are all the same. So it
allows you to say... hey that ink circle over there is 5 meters away. When you take this to cosmological scales it allows you to monitor the expansion
of the universe and figure out if it is linear, accelerating, or decelerating.