Welcome to the homepage of MUSIC - a program to generate zoom initial conditions for cosmological simulations. © 2013 by Oliver Hahn

MUSIC - (MUlti-Scale-Initial-Conditions)

is a computer program to generate nested grid initial conditions for high-resolution "zoom" cosmological simulations. MUSIC currently has the following features:

- Supports output for many cosmological simulation codes via plugins: RAMSES, ENZO, Gadget-2/3, Arepo, ART, Pkdgrav/Gasoline and NyX are currently supported. New codes can be added easily.

- Support for first (1LPT) and second order (2LPT) Lagrangian perturbation theory

- Pluggable transfer functions, currently CAMB, Eisenstein&Hu, BBKS, Warm Dark Matter variants. Distinct baryon+CDM fields are possible.

- Minimum bounding ellipsoid and convex hull shaped high-res regions supported with most codes optimizing the high-resolution volume. supports refinement mask generation for RAMSES.

- Parallelized with OpenMP

Requires FFTW (v2 or v3), GSL (and HDF5 for output for some codes)


This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of FITNESS FOR A PARTICULAR PURPOSE.

Please subscribe to the mailing list if you have questions regarding the use of MUSIC. Important updates will also be announced through the mailing list.

Consider using the version controlled access through the bitbucket repository for easier updates in the future.

In any scientific publication making use of MUSIC, please reference the code paper Hahn & Abel (2011)

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