Gauge invariance

Gauge invariance

For any compact simple gauge group G, a non-trivial quantum Yang–Mills theory exists on ℝ⁴ and has a mass gap Δ > 0. Construct the theory in a mathematically complete way (Wightman or equivalent) and prove the gap.

Gauge invariance —lemma→ Yang–Mills

Gauge invariance —implies→ Mass gap > 0