Estimates one percent squeezing in gravitational waves from nonlinear effects in the ringdown phase of black hole mergers using higher harmonic amplitude ratios.
Gauge invariant formalism for second order perturbations of schwarzschild spacetimes,
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Squeezed Quasinormal Modes from Nonlinear Gravitational Effects
Estimates one percent squeezing in gravitational waves from nonlinear effects in the ringdown phase of black hole mergers using higher harmonic amplitude ratios.