The existing field theories are based on the properties of closed exterior forms, which correspond to conservation laws for physical fields. In the present paper it is shown that closed exterior forms corresponding to field theories are obtained from the equations modelling conservation (balance) laws for material sistems (material media). The process of obtaining closed exterior forms demonstr...

We obtain the subleading tail to memory term in late time electromagnetic radiative field generated due a generic scattering of charged bodies. show that there exists new asymptotic conservation law which is related term. The corresponding charge made mode appears at $\mathcal{O}(e^5)$ and we expect it uncorrected higher orders. This hints arises from classical limit 2-loop soft photon theorem....