Simultaneous bounds on the gravitational dipole radiation and varying gravitational constant from compact binary inspirals

Compact binaries are an important class of gravitational-wave (GW) sources that can be detected by current and future GW observatories. They provide a testbed for general relativity (GR) in the highly dynamical strong-field regime. Here, we use GWs from inspiraling binary neutron stars black holes to investigate dipolar gravitational radiation (DGR) varying constant predicted some alternative theories GR, such as scalar-tensor gravity. Within parametrized post-Einsteinian framework, introduce parametrization these two effects simultaneously into compact binaries' inspiral waveform perform Fisher-information-matrix analysis estimate their simultaneous bounds. In general, space-based detectors give tighter limit than ground-based ones. The tightest constraints reach σB<3×10−11 DGR parameter B σG˙/G<7×10−9yr−1 G, when time coalescence event is close lifetime detectors. addition, analyze correlation between highlight importance considering both order arrive at more realistic results.