Instantons are the only SU(2) Yang-Mills solutions on R^4 with energy below 4π²(|κ| + 2) + ε_κ, and the energy spectrum is discrete in [0, 16π²) on the trivial bundle.
On the blow-up of Yang-Mills fields in dimension four
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The Yang-Mills equation near instanton-anti-instanton configurations
Instantons are the only SU(2) Yang-Mills solutions on R^4 with energy below 4π²(|κ| + 2) + ε_κ, and the energy spectrum is discrete in [0, 16π²) on the trivial bundle.