On the energy-momentum spectrum of a homogeneous Fermi gas

2011/11/03 by Dereziński, Jan, Meissner, Krzysztof A., Napiórkowski, Marcin
#FOS: Physical sciences #Mathematical Physics (math-ph)

paper · doi:10.48550/arxiv.1111.0787

Abstract

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.

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