Source field

In theoretical physics, a source field is a field $J$ whose multiple

appears in the action, multiplied by the original field $\Phi$ . Consequently, the source field appears on the right-hand side of the equations of motion (usually second-order partial differential equations) for $\Phi$ . When the field $\Phi$ is the electromagnetic potential or the metric tensor, the source field is the electric current or the stress–energy tensor, respectively.

单词	Source field
释义	Source field 英语百科 Source field In theoretical physics, a source field is a field $J$ whose multiple appears in the action, multiplied by the original field $\Phi$ . Consequently, the source field appears on the right-hand side of the equations of motion (usually second-order partial differential equations) for $\Phi$ . When the field $\Phi$ is the electromagnetic potential or the metric tensor, the source field is the electric current or the stress–energy tensor, respectively.
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