Hi people, help here please(adsbygoogle = window.adsbygoogle || []).push({});

When the Einstein equation are linearized the results are the weak field Einstein equations

$$

\left ( -\frac{\partial^{2}}{\partial t^{2}} + \nabla^{2} \right ) \bar h^{\mu\nu}=-16\pi T^{\mu\nu}

$$

a solution for this equations considering the source are the Retarded function

$$

\bar h^{\mu\nu} (t,\vec x)=4 \int d^{3}x' \frac{[T^{\mu\nu}(t',\vec x')]_{[ret]}}{|\vec x - \vec x'|}

$$

with

$$t' = t_{ret} = t-|\vec x - \vec x'|$$

until i know "t" and "x" in spacetime are the same but what physical situation describes

$$

|\vec x - \vec x'|

$$

Is similar to electromagnestism, when $$\vec x$$ represent the place where you want calculate the potencial and $$\vec x'$$ represent the place where the charge is located?

Thanks in advance

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# I Help to understand the Retarded Function

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