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Weak-field approximation

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The weak-field approximation in general relativity is used to describe the gravitational field very far from the source of gravity. In this approximation, we assume the metric for spacetime () be written in coordinates as:

where are the Minkowski metric components, is the deviation from the Minkowski metric and is taken to be a non-zero real constant. Calculating the Christoffel symbols , we get (upon ignoring terms of order higher than :

From this last equation, we find that:

()

()