Super-cluster simulations: impact of baryons on the matter power spectrum and weak lensing forecasts for Super-CLASS

Understand

We use a combination of full hydrodynamic and dark matter only simulations to investigate the effect that baryonic physics and selecting super-cluster regions have on the matter power spectrum, by re-simulating a sample of super-cluster sub-volumes.

• On large scales we find that the matter power spectrum measured from our super-cluster sample has at least twice as much power as that measured from our random sample.
• Our investigation of the effect of baryonic physics on the matter power spectrum is found to be in agreement with previous studies and is weaker than the selection effect over the majority of scales.
• In addition, we investigate the effect of targeting a cosmologically non-representative, super-cluster region of the sky on the weak lensing shear power spectrum.