Unitarity Entropy Bound: Solitons and Instantons

Understand

We show that non-perturbative entities such as solitons and instantons saturate bounds on entropy when the theory saturates unitarity.

• Simultaneously, the entropy becomes equal to the area of the soliton/instanton.
• This is strikingly similar to black hole entropy despite absence of gravity.
• We explain why this similarity is not an accident.