A geometric definition of mass

@article{GonzalezMartin1994AGD,
  title={A geometric definition of mass},
  author={Gustavo R. Gonzalez-Martin},
  journal={General Relativity and Gravitation},
  year={1994},
  volume={26},
  pages={1177-1185}
}
An invariant definition of mass is given, within the context of a geometric unified theory, in terms of the geometric connection and the matter current. This geometric mass corresponds to the concept of self energy and leads to the mass parameter in Dirac's equation. 
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