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A classical model of a stable particle of finite size is studied. The modelparameters can be chosen such that the described particle has the mass andradius of a proton. Using the energy-momentum tensor (EMT), we show how thepresence of long-range forces alters some notions taken for granted inshort-range systems. We focus our attention on the D-term form factor. Theimportant conclusion is that a more careful definition of the D-term may berequired when long-range forces are present.

Visualization of internal forces inside the proton in a classical relativistic model