Despite the plethora of evidence of the existence and abundance of dark matter we have from large scale cosmological observations, there is still little we know of its properties or its behaviour on small scales. A promising way to test this is through the effects it may have on the gravitational wave signal from black hole binary mergers. In particular, the presence of dark matter around black holes may lead to a distinctive dephasing of the signal due to dynamical friction. During the last stages of an extreme mass ratio inspiral, when the satellite object starts to move at relativistic speeds, this effect could be detectable by LISA. In this talk I will present the results from numerically calculating of the dynamical friction force on a black hole generated by a cloud of ultra-light scalar field. This has been studied before in the nonrelativistic case, and I will discuss how our results extend this description to the relativistic case, relevant on small scales.
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Zoom Meeting ID: 852 8915 0495
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