Example image of eyePlorer eyePlorer map for 'Gauge theory': Nontechnical introduction to gauge theory Field (physics) Invariant (physics) Lagrangian Lie group Lie algebra Quantum Non-abelian Yang–Mills theory Abelian group Photon Quantum electrodynamics Unitary group Circle group Gluon Special unitary group Standard Model W and Z bosons Global symmetry Point (geometry) Equivalence principle General relativity Action (physics) Chern–Simons theory Nonabelian group Symmetry group Classical electromagnetism James Clerk Maxwell David Hilbert Einstein field equations Electromagnetism Hermann Weyl Level of measurement Complex number Fritz London Phase (waves) Quantum mechanics Vladimir Fock Electric charge Electromagnetic field Elementary particle Wave function Pauli Atomic nucleus Chen Ning Yang Nucleon Particle physics Robert Mills (physicist) Strong interaction Abdus Salam