QCD and Asymptotic Freedom
The strong interaction becomes weaker at short distances and stronger at long distances.
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QCD and Asymptotic Freedom
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QCD
Quantum chromodynamics is the gauge theory of the strong interaction. Quarks carry color charge and gluons mediate the force.
Running Coupling
The strong coupling depends on the energy scale. At high energy or short distance, it becomes smaller. This is asymptotic freedom.
Confinement
At low energy, the coupling grows. Isolated quarks are not observed as free particles; physical states are color-neutral hadrons.
Complete Particle Physics
A standard introductory path through relativistic waves, symmetries, the Standard Model, and neutrino mixing.
Feynman Diagrams
Graphical bookkeeping for perturbative quantum field theory amplitudes.
Standard Model
The gauge theory describing known elementary particles and three fundamental interactions.