This might help https://physics.stackexchange.com/questions/169886/black-hole-area-theorem-and-hawking-radiation https://physics.stackexchange.com/questions/169

This might help https://physics.stackexchange.com/questions/169886/black-hole-area-theorem-and-hawking-radiation https://physics.stackexchange.com/questions/169886/black-hol... A black hole merger of this size is unlikely to have any significant quantum aspect