Abstract:We investigate how the speed of gravitational waves, cGW, can be tested by upcoming black hole ringdown observations. We do so in the context of hairy black hole solutions, where the hair is associated with a new scalar degree of freedom, forecasting that LISA and TianQin will be able to constrain deviations of cGW from the speed of light at the O(10−4) level from a single supermassive black hole merger. We discuss how these constraints depend on the nature of the scalar hair, what different aspects of the und… Show more
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