Séminaire : Predicting Baryon Acoustic Oscillations in the Era of High-Precision Cosmology

The next generation of galaxy surveys will measure the Baryon Acoustic Oscillations (BAO) signal in the matter power spectrum to unprecedented precision.

Current data already probe cosmological distances as encoded in the BAO pattern to a few per-cent accuracy. This requires a precise control of systematic errors. On the BAO scales baryonic effect are subdominant, nevertheless non-linearities of the matter density field can dilute the cosmological signal and introduce a systematic source of bias. 

In this talk I will review the subject and present results from unprecedented large volume high-resolution simulations that provide cosmic variance limited predictions of the 3D matter power spectrum, thus allowing for a precise assessment of non-linear effects on the BAO signal.