[FRIAM] Any non-biological complex systems?

[Marcus Daniels]

Stephen writes:

“My example was the physical phenomena of ferromagnetism not the Ising model that describes it. Eg heat up a physical magnet past its critical point (Curie temperature) and the metal loses its alignment/magnetic polarity as a collective property.”

The complex things an Ising model can compute require very particular J and h values.
These values won’t occur in either regime, or if they do with infinitesimal probability and only for a moment.   Particular Ising models that perform computation can be created in classical or quantum circuits, or in photonic systems, but those are engineered by humans.   So yes metamagnetic material is complex system in a technical definition (e.g. has phase transitions) but I think not what Russ was looking for in light of his later e-mails.

Marcus

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