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We study the degeneracy of theoretical gravitational waveforms for binaryblack hole mergers using an aligned-spin effective-one-body model. Afterappropriate truncation, bandpassing, and matching, we identify regions in themass--spin parameter space containing waveforms similar to the templateproposed for GW150914, with masses $m_1 = 36^{+5}_{-4} M_\odot$ and $m_2 =29^{+4}_{-4} M_\odot$, using the cross-correlation coefficient as a measure ofthe similarity between waveforms. Remarkably high cross-correlations are foundacross broad regions of parameter space. The associated uncertanties exceedthese from LIGO's Bayesian analysis considerably. We have shown that waveformswith greatly increased masses, such as $m_1 = 70 M_\odot$ and $m_2 = 35M_\odot$, and strong anti-aligned spins ($\chi_1=0.95$ and $\chi_2=-0.95$)yield almost the same signal-to-noise ratio in the strain data for GW150914.

Degeneracy of gravitational waveforms in the context of GW150914