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We present genetIC, a new code for generating initial conditions forcosmological N-body simulations. The code allows precise, user-specifiedalterations to be made to arbitrary regions of the simulation (whilemaintaining consistency with the statistical ensemble). These "geneticmodifications" allow, for example, the history, mass, or environment of atarget halo to be altered in order to study the effect on their evolution. Thecode natively supports initial conditions with nested zoom regions atprogressively increasing resolution. Modifications in the high-resolutionregion must propagate self-consistently onto the lower resolution grids; toenable this while maintaining a small memory footprint, we introduce aFourier-space filtering approach to generating fields at variable resolution.Due to a close correspondence with modifications, constrained initialconditions can also be produced by genetIC (for example with the aim ofmatching structures in the local Universe). We test the accuracy ofmodifications performed within zoom initial conditions. The code achievessub-percent precision, which is easily sufficient for current applications ingalaxy formation.

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