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We consider the prospect of detecting cubic Galileons through their imprinton gravitational wave signals from a triple system. Namely, we consider amassive Black Hole (BH) surrounded by a binary system of two smaller BHs. Weassume that the three BHs acquire a conformal coupling to the scalar fieldwhose origin could be due to cosmology or to the galactic environment. In thiscase, the massive BH has a Vainshtein radius which englobes the smaller onesand suppresses the scalar effects on the motion of the binary system. On theother hand the two binaries can be outside each other's redressed Vainshteinradius calculated in the background of the central BH, allowing for aperturbative treatment of their dynamics. Despite the strong Vainshteinsuppression, we find that the scalar effects on the binary system are slightlyenhanced with respect to the static case and a significant amount of power canbe emitted in the form of the Galileon scalar field, hence activelyparticipating in the inspiralling phase. We compute the modification to the GWphase and show that it can lead to a detectable signal for large enougheffective scalar coupling.

Unveiling the Galileon in a three-body system : scalar and gravitational wave production