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1. Locality

   Linked via "Minkowski spacetime"

   The most common interpretation of locality—often termed classical locality or Einsteinian locality—stipulates that an action performed at point A can only instantaneously influence events at point B if A and B are spatially coincident. For any non-coincident points, the influence requires a non-zero time interval dictated by the speed of light, $c$. This ensures that no information, energy, or causal effect travels faster than light, upholding the principle of causality.
   Mathematically, the restriction imposed by spatiotemporal locality can be expressed via the…

2. Stress Energy Tensor

   Linked via "Minkowski spacetime"

   Formal Definition and Components
   The stress-energy tensor is a $4 \times 4$ matrix in standard Minkowski spacetime, though it is generally defined on curved spacetime. Its components are indexed by Greek letters $\mu, \nu \in \{0, 1, 2, 3\}$, where the index 0 typically denotes the time dimension and indices 1, 2, 3 denote the spatial dimensions ($x, y, z$).
   The components of $T_{\mu\nu}$ carry specific physical interpretations: