On the Energy-Momentum Spectrum of a Homogeneous Fermi Gas |
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Authors: | Jan Dereziński Krzysztof A Meissner Marcin Napiórkowski |
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Institution: | 1. Department of Mathematical Methods in Physics, Faculty of Physics, University of Warsaw, Ho?a 74, 00-682, Warsaw, Poland 2. Institute of Theoretical Physics, Faculty of Physics, University of Warsaw, Ho?a 69, 00-681, Warsaw, Poland
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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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