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1. Spacetime Geometry

   Linked via "Weyl Integrability Models (WIMs)"

   Non-Metricity
   Non-metricity quantifies the rate at which the length of a vector changes under parallel transport, signifying that the metric tensor itself is not covariantly constant ($\nabla g{\mu\nu} \neq 0$). While standard General Relativity assumes zero non-metricity ($\nabla g{\mu\nu} = 0$), its non-zero presence is a hallmark of theories involving evolving fundamental constants or dynamically changing fundamental scales, such as those explored in [Weyl Integrability Models (WIMs)](/entries…