# Tag Info

## New answers tagged noethers-theorem

1

### Topological vs. non-topological noetherian charges

Let there be given a physical system. What charges are Noetherian and what charges are topological often depend on the precise action formulation and field content of the physical system, see also this Phys.SE post. To simplify the discussion, let us assume that the action formulation is fixed, and below definitions will then refer to this fixed ...

0

### Noether's identities

Let us use Einstein's summation convention, DeWitt's condensed notation, and follow Ref. 1. Let there be given an action $S_0[\varphi]$ for a classical field theory. Let $$\tag{17.1a} \delta\varphi^i~=~ R^i{}_{\alpha} \varepsilon^{\alpha}$$ be infinitesimal gauge transformations. Here $\varepsilon^{\alpha}$ are infinitesimal gauge parameters, and ...

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