General definition of “conserved quantities” in general relativity and other theories of gravity

@article{Wald1999GeneralDO,
  title={General definition of “conserved quantities” in general relativity and other theories of gravity},
  author={Robert M. Wald and Andreas Zoupas},
  journal={Physical Review D},
  year={1999},
  volume={61},
  pages={084027}
}
In general relativity, the notion of mass and other conserved quantities at spatial infinity can be defined in a natural way via the Hamiltonian framework: Each conserved quantity is associated with an asymptotic symmetry and the value of the conserved quantity is defined to be the value of the Hamiltonian which generates the canonical transformation on phase space corresponding to this symmetry. However, such an approach cannot be employed to define `conserved quantities' in a situation where… 

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