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Can any one give a derivation of the quadrupole moment in the TT gauge ( Equation metioned below ) of the gravitational wave ?

Q_{ij}^{TT}(x) = ∫ρ(x^{i}x^{j}-1/3δ^{ij}r^{2})d^{3}x

Where ρ is the matter density

Thanks In Advance

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# Derivation of the quadrupole moment of gravitational wave

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