SuperRad: Modeling the black hole superradiance gravitational waveform

Abstract

Gravitational signatures of black hole superradiance are a unique probe of ultralight particles that are weakly-coupled to ordinary matter. The existence of an ultralight boson would lead spinning black holes with size comparable to the Compton wavelength of the boson to become superradiantly unstable to forming an oscillating cloud, spinning down the black hole, and radiating gravitational waves in the process. However, maximizing the chance of observing such signals or, in their absence, placing the strongest constraints on the existence of such particles, requires accurate theoretical predictions. In this work, we introduce a new gravitational waveform model, SuperRad, that models the dynamics, oscillation frequency, and gravitational wave signals of these clouds by combining numerical results in the relativistic regime with fits calibrated to analytical estimates, covering the entire parameter space of ultralight scalar and vector clouds with the lowest two azimuthal numbers ($m=1$ and $2$). We present new calculations of the gravitational wave frequency evolution as the boson cloud dissipates, including using fully general-relativistic methods to quantify the error in more approximate treatments. Finally, as a first application, we assess the viability of conducting follow-up gravitational wave searches for ultralight vector clouds around massive black hole binary merger remnants. We show that LISA may be able to probe vector masses in the range from $1\times 10^{-16}$ eV to $6\times 10^{-16}$ eV using follow-up gravitational wave searches.

22 pages, 15 figures, code repository: www.bitbucket.org/weast/superrad , updated to match PRD version

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• Detecting the massive vector field with extreme mass-ratio inspirals
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