An extended model of elementary particles based on an analogy with superconductivity is presented. Starting from the modified Nambu-Jona-Lasinio model of a massless fermion field with the quartic self-interactions, we derive coupled differential equations for the self-consistent fermion mass based on the relativistic Hartree-Fock-Bogoliubov approximation. The physical implication of these equations is explored and is shown to suggest a stringlike picture for the extended hadrons.
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Eguchi et al. (1974) studied this question.
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