Speaker
Description
Studying the post-merger signal of binary-neutron-star systems can provide us with information about matter out of chemical and thermal equilibrium, complementary to what can be inferred from the inspiral phase. Although post-merger signals are weaker, as they involve frequencies in the kilohertz band, next-generation detectors, such as ET, are expected to enable their observation.
Analyzing post-merger signals will be challenging due to their complicated morphology and all the microphysics involved. We present a new model for the gravitational waves emitted in the post-merger phase that captures not only the main emission peak, but also the subdominant ones. The model is attached to current state-of-the-art binary-neutron-star models in order to provide a complete inspiral-merger-postmerger approximant. This allows us to exploit information about the system inferred during the inspiral to fine-tune the post-merger model, effectively yielding an inspiral-informed model that leverages the high-precision parameter measurement expected with ET.