| http://www.w3.org/ns/prov#value | - now repeat the steps developed in [1, 9] and introduce dimensionless variables for the baryon density and velocity: We next define the ''stretched coordinates'' x and t as in [8-10]: where R is a size scale and s is a small (0 < s < 1) expansion parameter chosen to be [10]: where u is the propagation speed of the perturbation in question.
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