Notation in This Article
is the speed of light, is the gravitational constant. "Geometric variables" are not used.
Latin indexes go from 1 to 3, Greek indexes go from 1 to 4. The Einstein summation convention is used.
is the Minkowski metric. is a tensor, usually the metric tensor. These have signature (−,+,+,+).
Partial differentiation is written or . Covariant differentiation is written or .
Read more about this topic: Alternatives To General Relativity
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