https://en.m.wikipedia.org/wiki/Bogomol%27nyi%E2%80%93Prasad%E2%80%93Sommerfield_state#:~:text=In%20theoretical%20physics%2C%20massive%20representations%20of%20an%20extended,exact%20equality%20to%20the%20modulus%20of%20Z%20exists.
It's a filthy job. So someone ought to do it.
https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.120.053904
In algebraic geometry and string theory, the phenomenon of wall-crossing describes the discontinuous change of a certain quantity, such as an integer geometric invariant, an index or a space of BPS state, across a codimension-one wall in a space of stability conditions, a so-called wall of marginal stability
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