Consider an expression of the following form:(adsbygoogle = window.adsbygoogle || []).push({});

$$I^{\mu\nu}(r) = \int d^{3}k\ \ d^{3}l\ \ \delta^{4}(r-k-l)\ (g^{\mu\nu}k\cdot{l}+k^{\nu}k^{\mu}-k^{\mu}l^{\nu})$$

##I^{\mu\nu}## must be of the form

$$I^{\mu\nu}(r) = Ar^{\mu}r^{\nu} + B\eta^{\mu\nu},$$

where ##A## and ##B## are constants.

How can you determine this tensorial form of ##I^{\mu\nu}##?

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# I Deducing the tensorial structure of a tensor

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