In quadratic gravity, longitudinal massive spin-2 modes make radiated power negative; projecting them out restores positive energy and angular momentum emission and slows the precession spin-down of an ellipsoid.
This numerical difference in the coupling factor appeared due to a small error in Ref
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Gravitational Waves Emission in Quadratic Gravity: longitudinal modes, angular momentum emission, and positivity of the radiated power
In quadratic gravity, longitudinal massive spin-2 modes make radiated power negative; projecting them out restores positive energy and angular momentum emission and slows the precession spin-down of an ellipsoid.