Beating non-linearities: improving the Baryon Acoustic Oscillations with the linear point

Understand

We propose a new way of looking at the Baryon Acoustic Oscillations in the Large Scale Structure clustering correlation function.

• We identify a scale s_LP that has two fundamental features: its position is insensitive to non-linear gravity, redshift space distortions, and scale-dependent bias at the 0.5% level; it is geometrical, i.e.
• independent of the power spectrum of the primordial density fluctuation parameters.
• These two properties together make s_LP, called the "linear point", an excellent cosmological standard ruler.