We present a code that evolves perturbations of a rapidly rotating compact object in equilibrium in linearised full general relativity in time. We derive the perturbation equations for the spacetime in the Hilbert gauge leading to wave equations, while the hydrodynamical evolution is based on perturbations of the energy-momentum tensor. We use Kreiss-Oliger dissipation in order to achieve a...
We present a numerical implementation of the Einstein equations under scalar tensor theories (STT) based on the Einstein Toolkit framework. We focus on the Jordan frame, where the influence of the scalar fields on the Einstein equations can be expressed through a modified BSSN (Baumgarte-Shapiro-Shibata-Nakamura) formalism while preserving the standard evolution of matter fields. This approach...
With the increasing number of gravitational wave detections by the LIGO-Virgo-KAGRA (LVK) Collaboration, as well as the prospect of the upcoming 3rd generation detectors such as the Einstein Telescope and Cosmic Explorer, we will need to be able to identify the gravitational wave source and extract properties of the source from the detector data. In order to do this effectively, we must...
