Post-merger black hole oscillates with characteristic complex frequencies omega_lmn = omega_R + i omega_I depending on mass + spin; first overtone l=m=2,n=0 dominates; tests no-hair theorem via independent (l,m,n) mode-fitting.
Post-merger black hole oscillates with characteristic complex frequencies omega_lmn = omega_R + i omega_I depending on mass + spin; first overtone l=m=2,n=0 dominates; tests no-hair theorem via independent (l,m,n) mode-fitting.