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Axion clouds may survive the perturbative tidal interaction over the early inspiral phase of black hole binaries
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abstract
Gravitational wave observation has the potential of probing ultralight bosonic fields such as axion. Axion forms a cloud around a rotating black hole (BH) by superradiant instability and should affect the gravitational waveform from binary BHs. On the other hand, considering the cloud associated with a BH in a binary system, tidal interaction depletes the cloud in some cases during the inspiral phase. We made the exhaustive study of cloud depletion numerically in a wide parameter range for equal mass binaries, assuming only the quadrupolar tidal perturbation is at work. We found that clouds can avoid disappearing due to the tidal effect only when $l=1$ mode is the fastest growing mode and when the binary orbit is counter-rotating in the non-relativistic parameter region.
Forward citations
Cited by 2 Pith papers
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Ultralight Boson Ionization from Comparable-Mass Binary Black Holes
Ionization of boson molecules bound to a black hole binary can dominate gravitational-wave losses during early inspiral, imprinting a turnover in the nanohertz GW background and circularizing the orbit.
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Environmental effects in extreme mass ratio inspirals: perturbations to the environment in Kerr
A perturbative calculation shows that a secondary body in Kerr spacetime creates a wake in a superradiant scalar cloud, with energy fluxes that differ from Schwarzschild predictions by tens of percent.
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