Constructive summation of the (2,2) quasi normal mode from a population of black holes

Understand

The quasi normal modes (QNMs) associated with gravitational-wave signals from binary black hole (BBH) mergers can provide deep insight into the remnant's properties.

• Once design sensitivity is achieved, present ground-based gravitational wave interferometers could detect potentially hundreds of BBH signals in the coming years.
• For most, the ringdown phase will have a very weak signal-to-noise ratio (SNR).
• Signal summation techniques allow information extraction from the weak SNR ringdowns.