3 He And Universe Parallelism

@inproceedings{Volovik19993HA,
  title={3 He And Universe Parallelism},
  author={G. Volovik},
  year={1999}
}
We discuss topological properties of the ground state of a spatially homogeneous ensemble of fermions. There are several universality classes of topologically different fermionic vacua; in each case the momentum space topology of the vacuum determines the low-energy (infrared) properties of the fermionic energy spectrum. Among them there is class of the gapless systems which is characterized by the Fermi-hypersurface. This class contains conventional Landau Fermi-liquid and also Luttinger… Expand

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