Zoology of condensed matter: framids, ordinary stuff, extra-ordinary stuff

@article{Nicolis2015ZoologyOC,
  title={Zoology of condensed matter: framids, ordinary stuff, extra-ordinary stuff},
  author={Alberto Nicolis and Riccardo Penco and Federico Piazza and Riccardo Rattazzi},
  journal={Journal of High Energy Physics},
  year={2015},
  volume={2015},
  pages={1-50}
}
A bstractWe classify condensed matter systems in terms of the spacetime symmetries they spontaneously break. In particular, we characterize condensed matter itself as any state in a Poincaré-invariant theory that spontaneously breaks Lorentz boosts while preserving at large distances some form of spatial translations, time-translations, and possibly spatial rotations. Surprisingly, the simplest, most minimal system achieving this symmetry breaking pattern — the framid — does not seem to be… 

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