Where Does Gravity Begin? Examining the Stress-Energy Tensor

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Hello
Just wondering where in the nature gravity could begin ?in what level? (apparently not in free space away from matter!)Elementary particles? higgs? quarks? where man kind could take the mathematical calculations to?

i.e Could two higgs show gravity ?or two electrons? or...?

"The stress–energy tensor is the source of the gravitational field in the Einstein field equations of general relativity" Where this tensor begins and is observable??

Cheers,
SON
 
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The current mainstream theory of gravity is classical, so it has no "starting line" in the sense you are asking. Any discussion of where that starting line might be for some future quantum theory of gravity would be purely speculative at this point.
 
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