Center of mass in special and general relativity and its role in an effective description of spacetime

  title={Center of mass in special and general relativity and its role in an effective description of spacetime},
  author={Chryssomalis Chryssomalakos and H. Hernandez-Coronado and Elias Okon},
  journal={arXiv: General Relativity and Quantum Cosmology},
In this contribution, we suggest the approach that geometric concepts ought to be defined in terms of physical operations involving quantum matter. In this way it is expected that some (presumably nocive) idealizations lying deep within the roots of the notion of spacetime might be excluded. In particular, we consider that spacetime can be probed only with physical (and therefore extended) particles, which can be effectively described by coordinates that fail to commute by a term proportional… Expand
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The Newtonian definition of the mass-centre can be generalized to the restricted theory of relativity in several ways. Three in particular lead to fairly simple expressions in terms of instantaneousExpand
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