Constraining Nonviolent Nonlocality by Stacking Gravitational Wave Events

Gravitational waves carry information about the structure of the black hole constituents. Giddings' nonviolent nonlocality proposes that the quantum information is transmitted by soft modes in the black hole's atmosphere. In contrast to firewalls, these quantum fluctuations would be spread out over a larger distance range — up to a Schwarzschild radius away. In this talk, we will calculate the waveform of such a binary black hole by modifying EOBNRv2. This waveform will exhibit random deviations, which is particularly evident in the plunge phase. Since this effect does not have a leading order PN term, we will construct an optimal method for hierarchical detection using principal component analysis. Even though there is not an optimal PN deformation dephasing term, we will estimate the constraint on nonviolent nonlocality from O3 data using a new method.