Electrovacuum Solution
In general relativity, an electrovacuum solution (electrovacuum) is an exact solution of the Einstein field equation in which the only nongravitational mass-energy present is the field energy of an electromagnetic field, which must satisfy the (curved-spacetime) source-free Maxwell equations appropriate to the given geometry. For this reason, electrovacuums are sometimes called (source-free) Einstein-Maxwell solutions.
Read more about Electrovacuum Solution: Mathematical Definition, Invariants, Einstein Tensor, Eigenvalues, Rainich Conditions, Test Fields, Examples
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