In special relativity, we introduced the momentum of a particle in a given Lorentz frame as p" =(E,p'), where E is the energy of the particle and p¹ is the relativistic 3-momentum. Explain why,in general relativity, the energy of a particle measured by an observer is given, irrespective of thecoordinate system used, by -p Uobs, where p" is the momentum of the particle and uobs is thevelocity of the observer in those coordinates.

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