Stochastic gravitational-wave background from spin loss of black holes

Abstract

Although spinning black holes are shown to be stable in vacuum in general relativity, there exists exotic mechanisms that can convert the spin energy of black holes into gravitational waves. Such waves may be very weak in amplitude, since the spin-down could take a long time, and a direct search may not be feasible. We propose to search for the stochastic background associated with the spin-down, and we relate the level of this background to the formation rate of spinning black holes from the merger of binary black holes, as well as the energy spectrum of waves emitted by the spin-down process. We argue that current LIGO-Virgo observations are not inconsistent with the existence of a spin-down process, as long as it is slow enough. On the other hand, the background may still exist as long as a moderate fraction of spin energy is emitted within Hubble time. This stochastic background could be one interesting target of next generation GW detector network, such as LIGO Voyager, and could be extracted from total stochastic background.

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• Ergoregion instability of exotic compact objects: electromagnetic and gravitational perturbations and the role of absorption
• A first search for a stochastic gravitational-wave background from ultralight bosons
• Modeling and searching for a stochastic gravitational-wave background from ultralight vector bosons
• Testing the nature of dark compact objects with gravitational waves
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• Searching for double-peak and doubly broken gravitational-wave spectra from Advanced LIGO-Virgo's first three observing runs
• Exploring the multiband gravitational wave background with a semi-analytic galaxy formation model
• Ergoregion instability in bosonic stars: scalar mode structure, universality, and weakly nonlinear effects
• String length constraining from the stochastic gravitational waves background
• Nonlinear evolution of the ergoregion instability: Turbulence, bursts of radiation, and black hole formation
• Tests for the existence of horizon through gravitational waves from a small binary in the vicinity of a massive object