On Shell And Off Shell
In physics, particularly in quantum field theory, configurations of a physical system that satisfy classical equations of motion are called on shell, and those that do not are called off shell.
For instance, in classical mechanics in the action formulation, extremal solutions to the variational principle are on shell and the Euler-Lagrange equations are on shell equations (i.e., they do not hold off shell). Noether's theorem is also another on shell theorem.
Read more about On Shell And Off Shell: Mass Shell
Famous quotes containing the word shell:
“Billy: You dropped some shell in there.
Ted: Its all right. Makes it crunchier that way. You like French toast crunchy, dont you?”
—Robert Benton (b. 1932)
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