A Surrogate Model for Ringdown

Next generation ground- and space-based detectors will provide us with hundreds of gravitational wave signals from binary black holes, and we will rely on quick, high-fidelity models to extract as much information as possible from these signals. LISA will have high enough sensitivity to capture multiple ringdown frequencies, enabling tests of general relativity. I will present current progress towards our multimode ringdown surrogate, which uses waveforms that are in the Bondi-van der Burg-Metzner-Sachs super rest frame. We use Gaussian process regression, a sophisticated mathematical tool to find joint Gaussian distributions between parameters and data. In future work this high-precision ringdown surrogate model may be incorporated into a full waveform surrogate.