Search for Precessing Binary Black Holes in Advanced LIGO's Third Observing Run using Harmonic Decomposition
Abstract
Binary black holes (BBHs) exhibiting spin-induced orbital precession offer unique insight into compact-binary formation channels, cosmology, and tests of general relativity. We conduct a dedicated search for precessing BBHs with unequal masses in Advanced LIGO's third observing run (O3) using the harmonic decomposition method of precessing waveforms. We introduce a novel scheme to reduce the number of filters in a harmonic search. With our new approach, our template bank requires 5× fewer filters compared to another proposed precessing search in the same region. We do not find any new significant events. Our new search method achieves up to 28\% improvement in sensitivity and up to 5× lower computational costs compared to existing precessing search pipelines. Our method enables scalable, sensitive searches for precessing BBHs in future gravitational-wave observing runs.
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