Astroparticle Seminar

Rescaling cosmological simulations from standard to modified gravity

Alexander Mead

University of Edinburgh

Modified gravity theories aim to explain the accelerated expansion of the cosmos without adding a cosmological constant into the Einstein field equations. Typically these theories have a close to standard expansion history but a modified growth rate of perturbations, and then some form of screening mechanism to ensure the return of gravity to the standard in solar-system and milky-way type environments. N-body simulations of such models are required in order to generate realistic mass maps and mock galaxy catalogues; so as to be able to test such theories with current and forthcoming cosmological surveys. I will show how it is possible to generate approximate simulations of modified gravity models using only a standard gravity simulation as a starting point.