Chordal Ringdown Toybox v1.0 — An Analyzer for the Harmonic Structure of Black Hole Ringdowns
**Previous:** []() ---  # 🎼 **Chordal Ringdown Toybox v1.0 — An Analyzer for the Harmonic Structure of Black Hole Ringdowns** ## Introduction The ringdown phase of a gravitational-wave event is the final “afterglow” emitted by a newly formed black hole. This signal is not a single tone—it is a **superposition of multiple quasi-normal modes (QNMs)**, resonating together like a **chord**. Up to *Ringdown Toybox v1.5*, the project focused on - listening to ringdowns, - visualizing them, - extracting them from data. It was a **box for observing**. With **Chordal Ringdown Toybox v1.0**, the project evolves into something new: a tool for **analyzing the harmonic structure** of ri...