1111.0787 (Jan Dereziński et al.)

On the energy-momentum spectrum of a homogeneous Fermi gas    [PDF]

Jan Dereziński, Krzysztof A. Meissner, Marcin Napiórkowski

We consider translation invariant quantum systems in thermodynamic limit. We argue that their energy-momentum spectra should have shapes consistent with effective models involving quasiparticles. Our main example is second quantized homogeneous interacting Fermi gas in a large cubic box with periodic boundary conditions, at zero temperature. We expect that its energy-momentum spectrum has a positive energy gap and a positive critical velocity.

View original: http://arxiv.org/abs/1111.0787