New posts in Gauge Invariance

Covariance in gauge theories: why should the Lagrangian be gauge invariant

Is it possible to have renormalisable C-, P-, or T-violating terms in QED?

Does a gauge transformation leave physics invariant?

"Large" gauge transformation doesn't act as do-nothing transformation in QFT: looking for classical analog

Why does normal ordering violate the Ward identity?

A question on gauge fixing

Why is the electron self-energy gauge dependent?

If Energy can be converted into mass, why can it not be converted into charge?

Energy Spectrum and Gauge Transformations

What, in simplest terms, is gauge invariance?