Global symmetry

In physics, a global symmetry is a symmetry that holds at all points in the spacetime under consideration, as opposed to a local symmetry which varies from point to point.

Global symmetries require conservation laws, but not forces, in physics.

An example of a global symmetry is the action of the $U(1)=e^{iq\theta}$ (for $\theta$ a constant - making it a global transformation) group on the Dirac Lagrangian:

单词	Global symmetry
释义	Global symmetry 英语百科 Global symmetry In physics, a global symmetry is a symmetry that holds at all points in the spacetime under consideration, as opposed to a local symmetry which varies from point to point. Global symmetries require conservation laws, but not forces, in physics. An example of a global symmetry is the action of the $U(1)=e^{iq\theta}$ (for $\theta$ a constant - making it a global transformation) group on the Dirac Lagrangian:
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