pyseobnr.eob.utils.nr_utils

BBH final spins and masses calculation utilities

The functions (and corresponding dependencies) come from lalinference.imrtgr.nrutils and are copied verbatim (LAL version 7.24, Feb. 2025):

• bbh_final_spin_non_precessing_HBR2016()

• bbh_final_mass_non_precessing_UIB2016()

• bbh_final_spin_precessing_HBR2016()

Functions

bbh_UIBfits_setup(m1, m2, chi1, chi2)	common setup function for UIB final-state and luminosity fit functions
bbh_final_mass_non_precessing_UIB2016(m1, ...)	Calculate the final mass with the aligned-spin NR fit by Xisco Jimenez Forteza, David Keitel, Sascha Husa et al. [LIGO-P1600270] [https://arxiv.org/abs/1611.00332] versions v1 and v2 use the same ansatz, with v2 calibrated to additional SXS and RIT data.
bbh_final_spin_non_precessing_HBR2016(m1, ...)	Calculate the (signed) dimensionless spin of the final BH resulting from the merger of two black holes with aligned spins using the fit from Hofmann, Barausse, and Rezzolla ApJL 825, L19 (2016), henceforth HBR.
bbh_final_spin_precessing_HBR2016(m1, m2, ...)	Calculate the dimensionless spin of the final BH resulting from the merger of two black holes with precessing spins using the fit from Hofmann, Barausse, and Rezzolla ApJL 825, L19 (2016), henceforth HBR.
calc_isco_radius(a)	Calculate the ISCO radius of a Kerr BH as a function of the Kerr parameter using eqns.