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A symmetric rank-2 tensor in relativity, which expresses the flux of energy-momentum along timelike and spacelike axes. Also known as the stress tensor or the energy-momentum tensor. In the Einstein field equations, it is the source of gravitational fields.
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Isolating the divergences in the stress energy tensor
In DeWitt's report "Quantum Field Theory in Curved Spacetime" (B. S. DeWitt, Phys. Rep. 19C, 292 (1975)), he states that in Eq.(175)
$$\langle in, vac| T^{\mu\nu}|in,vac\rangle = 2 \frac{\delta W}{\d …