- #1
Khrapko
- 64
- 0
Electrodynamics force is [tex]f_i=F_{ik}j^k=F_{ik}\partial_j F^{jk}[/tex]. I claim that the only way to obtain the Maxwell energy-momentum tensor [tex]T_i^j=-F_{ik}F^{jk}+\delta_i^jF_{kl}F^{kl}/4[/tex] is to write the force as a divergence: [tex]f_i=-\partial_jT_i^j[/tex].