Retrieving "Stellar Object" from the archives

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1. Spin Density

   Linked via "stellar object"

   Unlike the stress-energy tensor $T{\mu\nu}$, which couples to the metric tensor (curvature), the spin density tensor, often denoted $S^{\mu\nu\lambda}$ (related to the canonical angular momentum density), couples directly to the torsion tensor $T{\mu\nu\lambda}$. This coupling implies that materials possessing high intrinsic angular momentum density locally induce a twisting or rotational non-commutativity …