EXTENDED OBJECTS IN QUANTUM SYSTEMS AND SOLITON SOLUTIONS

It is shown that the soliton solutions of the classical Euler equations are closely related to the extended objects created in quantum many-body systems. The general argument is supplemented by a concrete example which shows how the boson transformation applied to a quantum system leads to the static soliton solution in the (1 + 1)-dimensional λφ4 model. © 1979 The American Physical Society.