Null Dust Solution
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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. A null dust solution (sometimes called a null fluid) is a Lorentzian manifold in which the Einstein tensor is null. Such a spacetime can be interpreted as an exact solution of Einstein''s field equation, in which the only mass-energy present in the spacetime is due to some kind of massless radiation.The components of a tensor computed with respect to a frame field rather than the coordinate basis are often called physical components, because these are the components which can (in principle) be measured by an observer.…mehr

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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. A null dust solution (sometimes called a null fluid) is a Lorentzian manifold in which the Einstein tensor is null. Such a spacetime can be interpreted as an exact solution of Einstein''s field equation, in which the only mass-energy present in the spacetime is due to some kind of massless radiation.The components of a tensor computed with respect to a frame field rather than the coordinate basis are often called physical components, because these are the components which can (in principle) be measured by an observer.