Fast frequency-domain gravitational waveforms for precessing binaries with a new twist

Understand

Gravitational waveform (GW) models are a core ingredient for the analysis of compact binary mergers observed by current ground-based interferometers.

• We focus here on a specific class of such models known as PhenomX, which has gained popularity in recent years thanks to its computational efficiency.
• We introduce a new description of the ``twisting-up'' mapping underpinning the construction of precessing waveforms within this family.
• The new description is an adaptation to the frequency domain of a technique previously implemented in time-domain models, where the orbit-averaged post-Newtonian spin-precession dynamics is numerically solved on the fly.