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Status](https://readthedocs.org/projects/gwaxion/badge/?version=latest)](https://gwaxion.readthedocs.io/en/latest/?badge=latest)\n[![DOI](https://zenodo.org/badge/DOI/10.5281/zenodo.4399365.svg)](https://doi.org/10.5281/zenodo.4399365)\n\n# gwaxion\n\nThis is a package to facilitate computations related to gravitational waves from ultralight-boson condensates around black holes.\nThe code was primarilty developed in writing [arXiv:1810.03812](https://arxiv.org/abs/1810.03812), but it is of broad applicability.\n\nThe primary objects in this package are:\n- `BlackHoleBoson`\n- `BosonCloud`\n\nTheir use, as well as other features, is demonstrated in a set of Jupyter notebooks in the `examples/` directory.\n\nComputations of boson cloud evolution and gravitational-wave emission rely on results from [arXiv:1411.0686](https://arxiv.org/abs/1411.0686), [arXiv:1706.06311](https://arxiv.org/abs/1706.06311) and made use of the data and code available in [gw_superradiance](https://github.com/richbrito/gw_superradiance).\n\n## Installation\n\n```\npip install gwaxion\n```\n\n## Usage\n\nHere is a barebones example to get some properties of a given black-hole--boson system, for a BH with mass `M = 50 Msun` and dimensionless spin `chi = 0.9`, and a boson with mass such that `alpha = 0.2`.\n\n``` python\nimport gwaxion\n\n# create a black-hole--boson object (scalar boson by default)\nbhb = gwaxion.BlackHoleBoson.from_parameters(m_bh=50, chi_bh=0.9, alpha=0.2)\n\n# get the fastest-growing boson level\n# (l, m, nr, growth rate in Hz)\nbhb.max_growth_rate()\n# \u003e (1, 1, 0, 4.175501554995195e-06)\n\n# get the mass of the corresponding cloud after superradiant growth\n# as a fraction of the original BH mass\ncloud = bhb.best_cloud()\ncloud.mass / cloud.bhb_initial.bh.mass\n# \u003e 0.066\n```\n\nFor more examples see the `examples/` directory.\n\n## Credit\n\nThis code was developed by [Maximiliano Isi](http://maxisi.me) with important contributions by [Richard Brito](https://richardbrito.weebly.com).\n\nIf you make use of this code for your own publications, please refer to the Zenodo DOI (see blue badge above) and cite:\n```\n@article{Isi:2018pzk,\n    author = \"Isi, Maximiliano and Sun, Ling and Brito, Richard and Melatos, Andrew\",\n    title = \"{Directed searches for gravitational waves from ultralight bosons}\",\n    eprint = \"1810.03812\",\n    archivePrefix = \"arXiv\",\n    primaryClass = \"gr-qc\",\n    reportNumber = \"LIGO-P1800270\",\n    doi = \"10.1103/PhysRevD.99.084042\",\n    journal = \"Phys. Rev. D\",\n    volume = \"99\",\n    number = \"8\",\n    pages = \"084042\",\n    year = \"2019\",\n    note = \"[Erratum: Phys.Rev.D 102, 049901 (2020)]\"\n}\n```\n\n(This might be replaced by a dedicated publication at a later date.)\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fmaxisi%2Fgwaxion","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fmaxisi%2Fgwaxion","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fmaxisi%2Fgwaxion/lists"}