INFLUENCE OF SPIN MAGNITUDE AND ORIENTATION ON GRAVITATIONAL-WAVEFORM MORPHOLOGY AND DETECTABILITY IN PRECESSING BINARY BLACK HOLES
DOI:
https://doi.org/10.60787/jnamp.vol73no.736Keywords:
Gravitational waves, binary black holes, Einstein Toolkit, spin precession, waveform morphologyAbstract
Spin-orbit misalignment in binary black hole (BBH) systems induces orbital precession, producing amplitude and phase modulations in gravitationalwave (GW) signals that affect waveform modelling and signal recovery. This study investigates the influence of spin magnitude (????) and spin tilt angle (????) on gravitational-wave morphology and matched-filter detectability using numerical relativity simulations performed with the Einstein Toolkit. Equalmass BBH systems (???? = 60 ????⊙) were simulated for spin magnitudes ???? = 0.0, 0.3, 0.7,and 0.9, and tilt angles of 0 ∘ , 30∘ , 60∘ ,and 90∘ . Increasing spin-orbit misalignment produced stronger amplitude and phase modulations, while larger spin magnitudes resulted in more pronounced orbital precession. The relative matched-filter signal-to-noise ratio decreased by up to approximately 16% compared with the aligned-spin configuration. These findings highlight the importance of incorporating spin precession into waveform models to improve gravitational-wave searches and parameter estimation.
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