The FLAMINGO project: Baryon effects on the matter power spectrum

Understand

The effect of baryon physics associated with galaxy formation onto the large-scale matter distribution of the Universe is a key uncertainty in the theoretical modelling required for the interpretation of Stage IV surveys.

• We use the FLAMINGO simulations to study the baryon response due to galaxy formation of the total matter power spectrum.
• We find that it is only well converged for simulation volumes in excess of $200^3$ Mpc$^3$.
• We report results for simulations of varying feedback intensity, which either match the X-ray inferred gas fractions in clusters and the $z=0$ stellar mass function, or shifted versions of the data, as well as for different implementations of AGN feedback.