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Gravitational-wave (GW) detections of binary neutron star coalescences play acrucial role to constrain the microscopic interaction of matter at ultrahighdensity. Similarly, if boson stars exist in the universe their coalescence canbe used to constrain the fundamental coupling constants of a scalar fieldtheory. We develop the first coherent waveform model for the inspiral of bosonstars with quartic interactions. The waveform includes coherently spin-inducedquadrupolar and tidal-deformability contributions in terms of the masses andspins of the binary and of a single coupling constant of the theory. We showthat future instruments such as the Einstein Telescope and the LaserInterferometer Space Antenna can provide strong complementary bounds on bosonicself-interactions, while the constraining power of current detectors ismarginal.

physical review. d/physical review. d.

Gravitational-wave detectors as particle-physics laboratories:  Constraining scalar interactions with a coherent inspiral model of boson-star  binaries