qnm: A Python package for calculating Kerr quasinormal modes, separation constants, and spherical-spheroidal mixing coefficients

Abstract

$\mathtt{qnm}$ is an open-source Python package for computing the Kerr quasinormal mode frequencies, angular separation constants, and spherical-spheroidal mixing coefficients. The $\mathtt{qnm}$ package includes a Leaver solver with the Cook-Zalutskiy spectral approach to the angular sector, and a caching mechanism to avoid repeating calculations. We provide a large cache of low $\ell ,m,n$ modes, which can be downloaded and installed with a single function call, and interpolated to provide good initial guess for root-polishing at new values of spin.

3 pages, 0 figures. Matches version accepted by the Journal of Open Source Software. The source repository: https://github.com/duetosymmetry/qnm , PyPI entry: https://pypi.org/project/qnm/ , documentation: https://qnm.readthedocs.io . Suggestions and pull requests welcome

References in corpus (3)

• The NumPy array: a structure for efficient numerical computation
• Gravitational perturbations of the Kerr geometry: High-accuracy study
• Mixing of spherical and spheroidal modes in perturbed Kerr black holes

Cited by in corpus (2)

• On the (non) existence of superregular boson clouds around extremal Kerr black holes and its connection with number theory
• Repeated Ringing of the Black Hole's Bell: Quasi-Normal Bursts from Highly Eccentric, Extreme Mass-Ratio Binaries