Noether 1918: Invariante Variationsprobleme
Noether 1918: Invariante Variationsprobleme
System notes
Every continuous symmetry of a physical system implies a conservation law.
Time invariance implies energy conservation; space invariance implies momentum conservation; rotation invariance implies angular momentum conservation.
Noether's 1918 paper contains two theorems: the first links global continuous symmetries to conservation laws; the second links local symmetries (gauge symmetries) to constraint identities.
Noether's theorem is conditional: it states that if a symmetry exists, then a conservation law follows, but does not explain why nature has symmetries or why their constants take specific values.
The theorem applies only to continuous symmetries; discrete symmetries (charge conjugation, parity, time reversal) fall outside its scope.
Noether's theorem applies to any Lagrangian system, spanning classical mechanics, quantum field theory, general relativity, particle physics, and cosmology.
The second theorem is the mathematical root of gauge theory, underlying Weyl, Yang-Mills, and the Standard Model.
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