Abstract
We shall now discuss the requirement III of finite energy-momentum, briefly mentioned in the previous section.
Clearly, the possibility of using solutions of non-linear field equations for the description of physical systems requires that such solutions have finite energy-momentum, and the localization properties of the physical measurements requires the existence of an energy-momentum density.
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Strocchi, F. 6 Sectors with Energy-Momentum Density. In: Symmetry Breaking. Lecture Notes in Physics, vol 643. Springer, Berlin, Heidelberg. https://doi.org/10.1007/10981788_7
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DOI: https://doi.org/10.1007/10981788_7
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