**11.43 Einstein’s equations**

The source of the gravitational field is the **energy–momentum tensor** *T _{ij}*. In many astrophysical and most cosmological models, the energy–momentum tensor is assumed to be that of a

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in which *g _{ij}* is the space-time metric.

An important special case is the energy–momentum tensor due to a nonzero value of the energy density of the vacuum. In this case *p* = –*ρ* and the energy– ...

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