New posts in Field Theory

Does the quadratic mass term $\frac{1}{2}m^2\phi^2$ belong to the free Lagrangian or is it an interaction term?

Operators "carrying" momentum and particle number

How do fields work?

Gauge fixing, Lorentz invariance and positive definite metric of Hilbert space

Noether's current for dilation transformation

How do fields transform under special conformal transformations?

What's the difference between perturbative QCD, non-perturbative QCD, and gauge theory QCD?

Poincare transformations and "three kinds of infinitesimal variations"

How many degrees of freedom in a massless $2$-form field?

Vector calculus in classical fields