Simple universal models capture all classical spin physics

  title={Simple universal models capture all classical spin physics},
  author={Gemma De las Cuevas and Toby S. Cubitt},
Spin models are used in many studies of complex systems because they exhibit rich macroscopic behavior despite their microscopic simplicity. Here, we prove that all the physics of every classical spin model is reproduced in the low-energy sector of certain “universal models,” with at most polynomial overhead. This holds for classical models with discrete or continuous degrees of freedom. We prove necessary and sufficient conditions for a spin model to be universal and show that one of the… CONTINUE READING

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