Non-linear contributions to angular power spectra

Understand

Future galaxy clustering surveys will probe small scales where non-linearities become important.

• Since the number of modes accessible on intermediate to small scales is very high, having a precise model at these scales is important especially in the context of discriminating alternative cosmological models from the standard one.
• In the mildly non-linear regime, such models typically differ from each other, and galaxy clustering data will become very precise on these scales in the near future.
• As the observable quantity is the angular power spectrum in redshift space, it is important to study the effects of non-linear density and redshift space distortion (RSD) in the angular power spectrum.