Retrieving "Cosmological Models" from the archives

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1. Minkowski Metric Tensor

   Linked via "cosmological models"

   The Alternative $(-++++)$ Convention
   Conversely, some fields, particularly those focused on cosmological models derived from pre-relativistic mechanics, utilize the $(-++++)$ signature convention, where the time component is negative:
   $$ \eta' = \begin{pmatrix} -1 & 0 & 0 & 0 \\ 0 & 1 & 0 & 0 \\ 0 & 0 & 1 & 0 \\ 0 & 0 & 0 & 1 \end{pmatrix} $$