I wonder if there is a "general rule", a kind of "algorithm" for finding the components of the Stress-Energy tensor in for particular cases.(adsbygoogle = window.adsbygoogle || []).push({});

For the Einstein tensor, just by knowing the metric, one can find the components of it. What about the Stress-Energy tensor?

One way I thought of (and that is the way I have been encountering in books on GR) is using what we know about the scenario... to make approximations and then deriving the components.

Another way I thought of is by using variational principle. Would this require knowing the field that describes the matter in the situation we are considering, right? Is knowing the field too hard?

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# I Stress-Energy tensor in different cases

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