[Phys-l] Baryon Acoustic Oscillations

[Mark Sylvester <mark.sylvester@spin.it>]

Looking at http://arxiv.org/abs/1203.6594v1

Have I got this right: there are discernible patterns in the 
distribution of galaxies that derive from sound waves in the early 
universe, when matter was still dense enough for this. The distance to 
these features is accurately known (how is this calibration achieved?) 
and thus provides a datum for getting distances to galaxies that lie on 
the features.

Mark.
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