In special relativity, we introduced the momentum of a particle in a given Lorentz frame as pH = (E,p), where E is the energy of the particle and p² is the relativistic 3-momentum. Explain why, in general relativity, the energy of a particle measured by an observer is given, irrespective of the coordinate system used, by -p "obs, where p is the momentum of the particle and us is the velocity of the observer in those coordinates. obs

In special relativity, we introduced the momentum of a particle in a given Lorentz frame as pH = (E,p), where E is the energy of the particle and p² is the relativistic 3-momentum. Explain why, in general relativity, the energy of a particle measured by an observer is given, irrespective of the coordinate system used, by -p "obs, where p is the momentum of the particle and us is the velocity of the observer in those coordinates. obs