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1. Stress Energy Tensor

   Linked via "Lagrangian density"

   Canonical vs. Believed Stress-Energy Tensors
   In classical field theory, one often defines a canonical stress-energy tensor derived from the Lagrangian density $\mathcal{L}$ via Noether's theorem:
   $$T{\mu\nu}^{\text{canonical}} = \frac{\partial \mathcal{L}}{\partial (\partial\mu \phia)} \partial\nu \phia - g{\mu\nu} \mathcal{L}$$