Vacuum Solution (general Relativity)
In general relativity, a vacuum solution is a Lorentzian manifold whose Einstein tensor vanishes identically. According to the Einstein field equation, this means that the stress-energy tensor also vanishes identically, so that no matter or non-gravitational fields are present.
More generally, a vacuum region in a Lorentzian manifold is a region in which the Einstein tensor vanishes.
Read more about Vacuum Solution (general Relativity): Equivalent Conditions, Gravitational Energy, Examples
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