Two talks:

Yiqiu Yang: An understanding of QNM spectral instability

Ref. 1: Black-hole spectroscopy: quasinormal modes, ringdown stability and the pseudospectrum

Hongyi Zhang: Exploration for possible degeneracy between different effects on GW phase

Ref. 1:Constraints on Nonlinear Tides due to p–g Mode Coupling from the Neutron Star Merger GW170817

Ref. 2:Probing Spin-Induced Quadrupole Moments in Precessing Compact Binaries

Ref. 3:Parameterized Post-Einsteinian Gravitational Waveforms in Various Modified Theories of Gravity