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

Understand

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 and binary black holes to investigate dipolar gravitational radiation (DGR) and varying gravitational constant predicted by some alternative theories to GR, such as the scalar-tensor gravity.
• Within the parametrized post-Einsteinian framework, we introduce the parametrization of these two effects simultaneously into compact binaries' inspiral waveform and perform the Fisher-information-matrix analysis to estimate their simultaneous bounds.