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Coordinate transformation into a standard flat metric
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[QUOTE="martinbn, post: 6867584, member: 252793"] The null geodesics in the usual Minkowski coordinates are given by ##x\pm t = const##. You can find them in the given coordinates and use that to set the coordinate change that matches them. In your case the null curves are given by ##dX^2=X^2dT^2##, which can be solved easily and gives ##Xe^{\pm T} = const## (you don't have to check that these are geodesics, if the change of variables works). So setting ##x+t = Xe^T## and ##x-t = Xe^{-T}## gives you the ones you found. [/QUOTE]
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Coordinate transformation into a standard flat metric
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