University of Pennyslvania
A more general standard rod for cosmology
The Baryon Acoustic Oscillation feature in the galaxy distribution has proved to be a remarkable standard rod for inferring cosmological distances. The oscillations are manifest as a peak in the pairwise correlation function of a variety of tracers of the dark matter distribution at pair separations of about 150 Mpc. There is also a dip at around 130~Mpc. Although evolution and scale-dependent tracer bias slightly shift or distort both the peak and dip, the point midway between them is invariant to sub-percent precision. I will describe why, and how this offers an alternative methodology to estimating the distance scale.