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$$ \frac{dP}{d\Omega} = = \frac{ G} {8 \pi c^2 } \left( \frac { d^3 Q_{ij} } { dt^3} {e}^{ij} \right) $$

I'm somewhat familiar with the quadrupole moment Q_{ij}, but not the polarization tensor ##e_{ij}##. Any pointers as to how this tensor is defined and/or where I can find more information? I don't recall reading about this tensor in any of my texts, but it seems to be important in reducing the tensor quantity resulting from the 3d time derivative of Q_{ij} into a scalar that can be squared, then summed to give the total emitted power in gravitational radiation from the power/unit angle.