GenetIC -- a new initial conditions generator to support genetically modified zoom simulations

Understand

We present genetIC, a new code for generating initial conditions for cosmological N-body simulations.

• The code allows precise, user-specified alterations to be made to arbitrary regions of the simulation (while maintaining consistency with the statistical ensemble).
• These "genetic modifications" allow, for example, the history, mass, or environment of a target halo to be altered in order to study the effect on their evolution.
• The code natively supports initial conditions with nested zoom regions at progressively increasing resolution.