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We propose a new way of looking at the Baryon Acoustic Oscillations in theLarge Scale Structure clustering correlation function. We identify a scale s_LPthat has two fundamental features: its position is insensitive to non-lineargravity, redshift space distortions, and scale-dependent bias at the 0.5%level; it is geometrical, i.e. independent of the power spectrum of theprimordial density fluctuation parameters. These two properties together makes_LP, called the "linear point", an excellent cosmological standard ruler. Thelinear point is also appealing because it is easily identified irrespectivelyof how non-linearities distort the correlation function. Finally, thecorrelation function amplitude at s_LP is similarly insensitive to non-linearcorrections to within a few percent. Hence, exploiting the particular Baryonfeatures in the correlation function, we propose three new estimators forgrowth measurements. A preliminary analysis of s_LP in current data isencouraging.

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