Speaker
Description
With the advent of third-generation gravitational-wave detectors, accurately modelling signals from binary neutron stars is essential to disentangle matter effects from possible deviations from general relativity. In this talk, I will present recent results on tidal effects in scalar–tensor theories, which are expected to be more prominent than in general relativity due to the presence of a time-varying scalar dipole moment inducing scalar-induced tidal deformations of neutron stars.
Using the post-Newtonian multipolar post-Minkowskian (PN–MPM) formalism, we compute tidal corrections in the radiative sector up to next-to-next-to-leading (relative 2PN) order, to reach a level where gravitationally induced tidal deformations start contributing. This includes the derivation of the emitted energy flux and to the waveform phasing. We further obtain the tidal contributions to the waveform amplitude modes up to relative 1.5PN order. Finally, the PN–MPM framework naturally incorporates hereditary (nonlocal-in-time) effects, such as tails and memories, which we show also carry tidal corrections relevant for high-precision waveform modelling in scalar–tensor gravity.
