Instability of the meson-boson-field solution for correlated Fermi systems
- 10 January 1986
- journal article
- Published by IOP Publishing in Journal of Physics C: Solid State Physics
- Vol. 19 (1) , L1-L5
- https://doi.org/10.1088/0022-3719/19/1/001
Abstract
The curvature of the ground-state energy of a correlated Fermi system (with respect to variations in the mean boson field around its extremum) is related to kinetic energy fluctuations in a Fermi gas, and is thus shown to be negative. Therefore the mean-field solution is unstable, and does not seem a good first approximation for describing the properties of such systems.Keywords
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