The Maxwell stress tensor is the flux density of this quantity in an electromagnetic field, and in special relativity, the inertial frame of a system that has the minimal energy compared to all other inertial frames has a value of zero for this quantity.
In optical systems, this quantity is conserved for a particle if the phase-matching condition is met. The Maxwell stress tensor is the flux density of this quantity in an electromagnetic field, and in special relativity, the inertial frame of a system that has the minimal energy compared to all other inertial frames has a value of zero for this quantity. Its commutator with the position operator is i times h-bar, because it is the Fourier transform of position. Generalized forms of this quantity are found by taking the derivative of the Lagrangian with respect to generalized velocities. By Noether's theorem, translational symmetry implies its conservation. For 10 points, name this quantity conserved in systems subjected to no external forces, the product of the mass and velocity.
In optical systems, this quantity is conserved for a particle if the phase-matching condition is met.
(linear) momentum