Condensed Matter Physics, 1995, No. 6, p. 23-34, English
The connection between the method of collective variables and the field theory methods is analyzed using as an example the relativistic system of charged particles. It is shown that partition sum can be written in the form of integral by the paths of particles in the configuration space, classical action of which is not additive, after the elimination of field variables. The correction to the energy of heat radiation is calculated.
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