On the basis of a non-local Lagrangian for Maxwell equations in a dispersive medium, the energy-momentum tensor of the field is derived. We obtain the Field equations through variational methods and an extension of Noether theorem for a non-local Lagrangian is obtained as well. The electromagnetic energy-momentum tensor obtained in the general context is then specialized to the case of a field with slowly varying amplitude on a rapidly oscillating carrier.

中文翻译：

---

色散介质中电磁场的能量-动量张量

基于色散介质中麦克斯韦方程的非局部拉格朗日量，推导出场的能量-动量张量。我们通过变分方法获得了场方程，并且还获得了对非局部拉格朗日量的诺特定理的扩展。在一般情况下获得的电磁能量-动量张量然后专门用于在快速振荡的载体上具有缓慢变化幅度的场的情况。