Constraining Scalar-tensor Theories Using Neutron Star–Black Hole Gravitational Wave Events

With the continuous upgrade of detectors, greater numbers gravitational wave (GW) events have been captured by LIGO Scientific Collaboration and Virgo (LVC), which offer a new avenue to test general relativity explore nature gravity. Although various model-independent tests performed LVC in previous works, it is still interesting ask what constraints can be placed on specific models current GW observations. In this work, we focus three scalar-tensor theories, Brans–Dicke theory (BD), with scalarization phenomena proposed Damour Esposito-Farèse (DEF), screened modified gravity (SMG). Of four possible neutron star–black hole that occurred so far, use two them place constraints. The other are excluded work because unphysical deviations. We consider inspiral range cutoff frequency at innermost stable circular orbit add modification dipole radiation into waveform template. scalar charges stars term derived solving Tolman–Oppenheimer–Volkoff equations for different state. obtained performing full Bayesian inference help open source software Bilby. results show given GWs comparable those pulsar timing experiments DEF theory, but not competitive solar system BD SMG theories.