BPS states in (2,0) theory on R x T5

Understand

We consider $(2, 0)$ theory on a space-time of the form $R \times T^5$, where the first factor denotes time, and the second factor is a flat spatial five-torus.

• In addition to their energy, quantum states are characterized by their spatial momentum, 't Hooft flux, and $Sp (4)$ $R$-symmetry representation.
• The momentum obeys a shifted quantization law determined by the 't Hooft flux.
• By supersymmetry, the energy is bounded from below by the magnitude of the momentum.