CC intro 1

Any addition to the Einstein eq Gmn = k Tmn must be symmetric, rank-2, zero-divergence Simplest: the metric tensor gmn itself

Gmn - L gmn = k Tmn

not to contradict the usual validation of Newton’s law: the free parameter L must be extremely small ? that it is relevant only on the cosmic scales

k = - 8pGN/c4

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