Can Oscillatory and Persistent Nonlinearities Be Bridged in Black Hole Ringdown?

Jun-Xi Shi, Zhen-Tao He, Jiageng Jiao +4

Quadratic quasinormal modes (QQNMs) and Christodoulou memory effect are key nonlinear phenomena in gravitational wave physics. QQNMs characterize the near zone nonlinear response o…