Repository: https://bitbucket.org/weast/superrad/src/master/

SuperRad is an open-source python code for modelling ultralight boson clouds that arise through black hole superradiance, as well as the gravitational waveform emitted from clouds around isolated black holes. It uses state-of-the-art numerical results in the relativistic regime combined with all available analytic estimates to describe the dynamics and gravitational wave signals of ultralight scalar or vector clouds.

The public code is accompanied by an extensive documentation of the available functionalities is presented in the repository’s website. Once all data is cached, each waveform can be generated on 10 ms timescales or less. Below are a few plots illustrating SuperRad’s output with a few examples.

The superradiance instability growth timescales as a function of the gravitational fine structure constant and the black hole’s mass, for a fixed dimensionless spin of 0.73 of the m=1 and m=2 modes of an ultralight vector boson:

The quasi-monochromatic gravitational wave emission from these ultralight vector boson clouds is characterized by a frequency at peak, the subsequent time-derivative of the gravitational wave frequency, as well as the gravitational wave decay timescale: