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PyUltraLight simulates the dynamics of ultralight dark matter in anon-expanding background. PyUltraLight can describe the evolution of severalinteracting ultralight dark matter halos or one or more halos orbiting acentral, fixed Newtonian potential, the latter scenario corresponding to dwarfgalaxies orbiting a massive central galaxy. We verify PyUltraLight by showingthat it reproduces qualitative dynamical features of previously publishedsimulations and demonstrate that it has excellent energy-conservationproperties. PyUltraLight is implemented in a Python-based Jupyter notebook,solving the Schrodinger-Poisson equation governing ultralight scalar field darkmatter dynamics in the non-relativistic regime using a symmetrised split-steppseudospectral algorithm. The notebook interface makes it simple to specifysimulation parameters and visualise the resulting output butperformance-critical routines are managed via calls to computationallyefficient compiled libraries. PyUltraLight runs on standard desktop hardwarewith support for shared memory mutlithreading and is available on GitHub.

PyUltraLight: A Pseudo-Spectral Solver for Ultralight Dark Matter Dynamics