Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. In general relativity, specifically in the Einstein field equations, a spacetime is said to be stationary if it admits a Killing vector that is asymptotically timelike.In general relativity the mass potential M plays the role of the Newtonian gravitational potential. A nontrivial angular momentum potential J arises for rotating sources due to the rotational kinetic energy which, because of mass-energy equivalence, can also act as the source of a gravitational field. The situation is analogous to a static electromagnetic field where one has two sets of potentials, electric and magnetic. In general relativity, rotating sources produce a gravitomagnetic field which has no Newtonian analog.
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